You might have learned in your science classe...

You might have learned in your science classes that the sun is quite large and heavy. What if you heard that we’ve found a black hole that contains the mass (质量) of nearly 70 suns?

Chinese scientists used LAMOST, a powerful Chinese telescope (望远镜), as well as telescopes in Hawaii and the Canary Islands, to make this discovery.

According to Einstein’s theory, black holes come from dying stars. The star collapses (坍塌) into a small point with a lot of mass and strong gravity (引力). The strong gravity of the black hole allows it to pull other things in and “eat” them. Scientists search for black holes by looking at x-rays that are released when they “eat” nearby stars. However, when black holes are inactive, this method doesn’t work.

This time, the researchers looked at stars that orbit invisible (看不见的) objects. These objects, they believe, cannot be anything but black holes. After calculating (计算) the speed of one particular star in a star system named LB-1, the scientists figured out that it was orbiting (绕轨道运行) a stellar-mass black hole.

The black hole’s mass is about 70 times the mass of our sun. According to current theory, this black hole shouldn’t even be able to exist. It was previously believed that the mass of such a black hole cannot be bigger than that of 25 suns. Stellar (星球的) winds blow away the heavy elements that are left behind when a star dies. But somehow, this black hole kept most of its heavy elements.

Researchers said it is possible that the black hole formed out of two large stars that died and merged (结合) together.

The discovery is also inspiring some researchers to revisit their previous studies. “This discovery forces us to re-examine our models of how stellar-mass black holes form,” University of Florida physicist David Reitze was quoted as saying in a press release.

1.How did Chinese scientists find the stellar-mass black hole?

A.By looking at stars moving away from the black hole.

B.By studying x-rays that came from the black hole.

C.By calculating the gravity of a nearby black hole.

D.By looking at the speed of a star that orbits it.

2.What does the underlined word “inactive” mean in Chinese?

A.积极的 B.不活跃的 C.快速的 D.活泼的

3.What do we know about the black hole?

A.It is much heavier than the sun. B.It is moving faster than the sun.

C.It hasn’t “eaten” any stars. D.It will disappear soon.

4.What is the last paragraph about?

A.The importance of this discovery.

B.Previous studies on black holes.

C.The formation (形成､构成) of stellar-mass black holes.

D.The preparations that were done before making this discovery.

5.What do we know from the story?

A.Black holes are usually heavier than 25 suns.

B.We cannot believe current scientific theories.

C.Black holes can form after stars die.

D.Stellar-mass black holes contain no heavy elements.

九年级英语阅读单选困难题查看答案及解析

1.According to the material, experts encourage students to _____.

A. review the texts　　 B. discuss with each other

C. answer questions actively　　 D. explain things in their own words

2.Who would like to ask a classmate rather than a teacher?

A. Eliza.　　 B. Judy.　　 C. Tara.　　 D. Sam.

3.In Ted's school, students aren't allowed to talk in _____ classes.

A. science　　 B. art　　 C. Chinese　　 D. music

4.How many students think talking in class is a good idea?

A. Two.　　 B. Three.　　 C. Four.　　 D. Five.

5.Where could we read this material?

A. In a storybook.　　 B. On the website.

C. On a notice board.　　 D. In a student's diary.

九年级英语阅读单选中等难度题查看答案及解析

Some people bring out the best in you in a way that you might never have fully realized on your own. My mom was one of those people.

My father died when I was nine months old. Mom and I lived a very hard life. We had little money, but my mom gave me a lot of love. Each night, she spoke the words that would change my life, “Kemmons, you are certain to be a great man and you can do anything in life if you work hard enough to get it.”

At fourteen, I was hit by a car and the doctors said I would never walk again. Every day, my mother spoke to me in her gentle, loving voice, telling me that I could walk again if I wanted strongly enough. She drove that message so deep into my heart that I finally believed her. A year later, I returned to school — walking on my own!

When the Great Depression (大萧条) hit, my mom lost her job. Then I left school to support  both of us. At that moment, I decided never to be poor again.

Over the years, I experienced various levels of business success. But the real turning point happened on a vacation I took with my wife and five kids in 1951. I wasn’t satisfied with the second-class hotels available for families and was angry that they asked me an extra $2 for each child. That was too expensive for many American families. I told my wife that I was going to open a motel (汽车旅馆) for families that would never ask extra for children. There were plenty of doubters at that time.

Of course mom was one of my strongest supporters. She worked behind the desk and even designed the room style. But with my mother’s support and encouragement, I never doubted we would succeed. Fifteen years later, we had the largest hotel system in the world — Holiday Inn. In 1979 my company had 1,759 inns in more than fifty countries with an income (收入) of $ 1 billion a year.

You may not have started out life in the best situation. But if you can find a task in life worth working for and believe in yourself, nothing can stop you.

1.According to the writer, who played the most important role in making him walk back to school again?

2.What caused Kemmons to start a motel by himself?

3.Which of the following best describes Kemmons’ mother?

4.Which of the following led to Kemmons’ success according to the passage?

九年级英语阅读理解困难题查看答案及解析

Some people bring out the best in you in a way that you might never have fully realized on your own. My mom was one of those people.

My father died when I was nine months old, making my mom a single mother at the age of eighteen. While I was growing up, we lived a very_______life. We had little money, but my mom gave me a lot of love. Each night, she sat me on her lap and spoke the words that would　　 ________　　 my life, “Kemmons, you are certain to be a great man and you can do anything in life if you work hard enough to get it.”

At fourteen, I was hit by a car and the doctors said I would never_______again. Every day, my mother spoke to me in her gentle, loving ________, telling me that no matter what those doctors said, I could walk again if I didn’t want to be bad enough. She drove that message _______deep into my heart that I finally believed her. A year later, I returned to school-walking on my own!

When the Great Depression（大萧条）hit, my mom lost her job. Then I left school to support _____ of us. At that moment, I decided never to be__________again.

Over the years, I experienced various（不同类别的） levels of business success. But the real turning point happened on a vacation I took with my wife and five kids in 1916. I was unhappy with the second-class hotels for families and was __________ that they charged（收费）an extra（额外的） $2 for each child. That was too_______for most American families. I told my wife that I was going to open a hotel for families that would never charge extra for ______. There were plenty of doubters at that time.

Not______, mom was one of my strongest supporters. She worked behind the desk and even designed the room style. As in any business, we experienced a lot of hard time. But with my mother’ s words deeply rooted（扎根） in my heart, I________doubted（怀疑） we would succeed. Fifteen years later, we had the largest______system in the world - Holiday Inn . In 1979 my company had 1,759 inns（客栈）in more than fifty countries with an income of $1 billion a year.

You may not have started out life in the best situations. But if you can find a_______in life worth working for and believe in yourself, _______can stop you.

1.A. quiet　　 B. boring　　 C. hard　　 D. strange

2.A. accept　　 B. change　　 C. disturb　　 D. check

3.A. study　　 B. speak　　 C. listen　　 D. walk

4.A. voice　　 B. sound　　 C. noise　　 D. talk

5.A. so　　 B. such　　 C. very　　 D. quite

6.A. all　　 B. both　　 C. every　　 D. most

7.A. excited　　 B. brave　　 C. patient　　 D. poor

8.A. sad　　 B. happy　　 C. tired　　 D. angry

9.A. expensive　　 B. fantastic　　 C. different　　 D. special

10.A. husband　　 B. parents　　 C. children　　 D. wife

11.A. successfully　　 B. surprisingly　　 C. interestingly　　 D. importantly

12.A. always　　 B. sometimes　　 C. almost　　 D. never

13.A. restaurant　　 B. theatre　　 C. library　　 D. hotel

14.A. task　　 B. hotel　　 C. company　　 D. word

15.A. nothing　　 B. everything　　 C. something　　 D. anything

九年级英语完型填空中等难度题查看答案及解析

Some people bring out the best in you in a way that you might never have fully realized on your own. My mom was one of those people.

My father died when I was nine months old, making my mom a single mother at the age of eighteen. While I was growing up, we lived a very 36  life. We had little money, but my mom gave me a lot of love. Each night, she sat me on her lap and spoke the words that would 37  my life, “Kemmons, you are certain to be a great man and you can do anything in life if you work hard enough to get it.”

At fourteen, I was hit by a car and the doctors said I would never 38  again. Every day, my mother spoke to me in her gentle, loving voice, telling me that no matter what those doctors said, I could walk again if I didn’t want to be bad enough. She 39  that message so deep into my heart that I finally believed her. A year later, I returned to school-walking on my own!

When the Great Depression（大萧条）40 , my mom lost her job. Then I left school to support（支撑） both of us. At that moment, I decided never to be 41  again.

Over the years, I experienced various levels of business success. But the real 42  point happened on a vacation I took with my wife and five kids in 1916. I was dissatisfied with the second-class hotels for families and was angry that they charged（收费）an extra $2 for each child. That was too 43  for most American families. I told my wife that I was going to open a hotel for families that would never charge extra for 44 . There were plenty of doubters at that time.

Not 45 , mom was one of my strongest supporters. She worked behind the desk and even designed the room style. As in any business, we experienced a lot of hard time. But with my mother’s words deeply rooted in my heart, I 46  doubted we would succeed. Fifteen years later, we had the largest hotel system in the world­ - Holiday Inn. In 1979 my company had 1,759 inns in more than fifty countries with an income of $1 billion a year.

You may not have started out life in the best situations. But if you can find a 47   in life worth working for and believe in yourself, nothing can stop you.

1.A. quiet          B. boring               C. hard          D. strange

2.A. accept         B. change               C. disturb           D. check

3. A. study         B. speak                C. listen            D. walk

4.A. drove              B. expected        C. explained        D. covered

5.A. did            B. hit             C. cut           D. fit

6.A. excited       B. brave                C. patient           D. poor

7.A. leading            B. breaking         C. turning      D. celebrating

8. A. expensive     B. fantastic            C. different        D. special

9.A. husband        B. parents          C. children          D. wife

10.A. successfully     B. surprisingly          C. interestingly     D. importantly

11.A. always           B. sometimes            C. almost       D. never

12.A. task              B. hotel               C. company      D. wor

九年级英语完型填空简单题查看答案及解析

Your parents might have told you that you'd go blind from reading in the dark, but you could make up for it by eating a lot of carrots.This is just one of the wrong ideas you may have heard of.Here are scientific explanations for three mistakes people often make about our eyes

Can eating carrots improve your eyesight(视力)?

Carrots are rich in Vitamin A, which is essential for our eyes.Vitamin A helps people to see in low light conditions.However, eating more carrots doesn’t help you see better.A certain number of carrots will help, but a large number of carrots will not make you get rid of(摆脱) your glasses.

If your parents have bad eyesight, will you have bad eyesight, too?

Myopia(近视) can be inherited(经遗传得到) from parents.A study found that if both parents have myopia, there is a 33 to 60 percent chance that the child has.For children who have one parent with myopia, the chance is 23 to 40 percent, and it is down to 6 to 15 percent for kids with non-myopia parents.So no matter how bad your parents’ eyesight is, you will have a chance of having good eyesight.

Is it true that people who are color-blind can't see colors?

Color blindness doesn’t mean that someone can’t see colors at all.It means that some has difficulty seeing differences in certain colors, usually green and red or blue and yellow.Color blindness is usually a condition caused by not having cone cells(视锥细胞) or having the cells that don't work.There are different levels of color blindness. Some people cannot tell the differences between colors when light isn’t bright, while others have difficulty in any light.

1.Which of the following is the right idea about eating carrots?

A.Eating carrots doesn't help people see better.

B.People need to eat as many carrots as possible.

C.A certain number of carrots are enough for eyes.

D.Only people who have bad eyesight need to eat carrots.

2.The underlined word “essential” in the passage means “__________”in Chinese.

A.难以获取的 B.稍有影响的 C.极其罕见的 D.必不可少的

3.What can we learn according to the passage?

A.Children may inherit myopia from their parents.

B.Kids with non-myopia parents won't have myopia.

C.A kid has a 50% chance of having myopia if his or her father has myopia.

D.Kids with short-sighted parents won't have good eyesight.

4.What can we know about color blindness from the passage?

A.Having no cone well may cause color blindness.

B.People who are color-blind cannot see colors at all.

C.Those who can't tell green from red are not really color-blind.

D.Most people who are color-blind can only see black and white.

5.What's the best title for the passage?

A.Advice on staying away form myopia.

B.Reasons for bad eyesight and color blindness.

C.Explanations for some wrong ideas about eyes.

D.Medical information about improving your eyesight.

九年级英语阅读单选中等难度题查看答案及解析

We learned in geography class that the earth __________around the sun.

A. go　　　　　　　　　 B. goes　　　　　　　　 C. went　　　　　　　　 D. did go

九年级英语单项填空简单题查看答案及解析

Are you having trouble in science? If so, read the following tips to learn how to do well in science?

1.___________ Science can be useful and interesting. It’s important to be confident in order to do well in science. You should enter your lab with the thought that you might learn something useful or interesting.

2.___________ If you know you’re going to learn something important, then carefully read it before class. It will give you some understanding of the subject before you begin studying it.

3.___________ Listen to what the teacher is saying and nod once in a while to show that you’re listening. Make sure you always raise your hand and it shows that you pay attention and take this seriously.

4.___________ After class, you can read the textbook and write what you can remember. Then look for differences between the textbook and what you wrote. If you don’t understand something, just ask the teacher, and they will help.

从A、B、C、D中选择正确的选项作为文章第2-5段的小标题， 并填入四个空格中。

A. Pay attention in classes                 B. Go over after class

C. Read before class                     D. Be confident

5.Which is the best title for the passage?

A. How to be a science teacher　　　　　　      B. How to be a scientist　

C. How to do well in science　　　　　　　　 D. How to pay more attention in class

九年级英语阅读理解中等难度题查看答案及解析

Have you ever noticed that you seem to learn faster in certain classes but slowly in others? Maybe you think it’s because of the different difficulties of subjects, but the real reason is that our learning types are different.

Now, you may wonder what a learning type is and how to find yours.

There are mainly three different learning types: Visual, Auditory and Kinesthetic. You can be a combination(混合) of learning types, but most people have one main type. Visual learners learn best by seeing. If you seem to easily remember information from pictures, charts and videos, you are likely a visual learner. Auditory learners learn best by hearing. If you seem to remember things by hearing them, then you are likely an auditory learner.

Kinesthetic learners learn best by doing. If you seem to learn best by working with your hands or testing out what you are shown, you are likely a kinesthetic learner.

So now that you know your personal learning style, the trick is to find out how to use your new-found knowledge to help you　 in your classes.

Tips for Visual Learners

＊Pay attention! For visual learners, this is very important! If your teacher uses a PowerPoint, watch the pictures carefully and find out what they might include and their hidden meanings.

＊Take notes by drawing charts and connecting ideas instead of just copying

down a list. This way, your brain will easily connect the different concepts(概念). You can even draw pictures if you find that works better for you.

＊Mark your notes or your note cards in different colors. This will help your

brain in keeping all of the information separate. Different colors show different types of information or importance.

＊Download the PowerPoint if your teacher puts it on QQ. This way, you canreview them before an exam.

Tips for Auditory Learners

＊Again, pay attention! If you aren’t listening while the lecture is happening, then as an auditory learner, you’re missing the easiest way for you to learn.

＊If your teacher allows you to record the lecture, record it for future

listening.

＊If you find that taking notes stops you from listening, ask a friend if you can borrow his or her notes or write down everything you remember right after the lesson.

Tips for Kinesthetic Learners

＊The first point is paying attention once again! For kinesthetic learners, it’s especially important to take notes either by writing or typing, in order to actively get information as you receive it.

＊Make use of laboratories and other class activities. Focus on what you’re

learning from the experience and pay close attention to the process that you go through.

＊Visualize! That is to imagine yourself picking up information and putting it into a category(类别). This may sound silly, but in this way you’re “doing” something without actually physically doing it.

＊Rewrite notes and reread information. Try to translate the information into examples. This can help kinesthetic learners remember what they need to know.

九年级英语阅读理解困难题查看答案及解析

Have you found that boys seem to do well in science while girls have a better vocabulary? If your answer to the question is “Yes”, you are________. Here are some facts, according to a _______ in Modern Science.

In general, men score higher, on _______ about math, physics, chemistry and the kind of solving skills. But women _______ better ability about spelling, vocabulary and memory. It is _______ that bones, muscles and nerves（神经）grow faster in baby girls. Usually, too, baby girls _______ at an earlier age than boys do. Scientists think that there is a________ reason for that. The left side of the brain develops faster in girls than boys. And it is just this side of the brain that runs a person’s ability to _______ words, to spell and to remember things.

By the time the children start school, little girls have an advantage that boys don’t have. And the advantage is very _______ for them to study well. So girls are always________ than boys in class, especially in primary school. Do you agree?

1.A. right　　 B. wrong　　 C. true

2.A. job　　 B. research　　 C. task

3.A. day　　 B. night　　 C. exams

4.A. show　　 B. do　　 C. make

5.A. 1ooked　　 B. seemed　　 C. believed

6.A. talk　　 B. work　　 C. play

7.A. careless　　 B. physical　　 C. popular

8.A. speak　　 B. like　　 C. use

9.A. difficult　　 B. helpful　　 C. kind

10.A. more confident　　 B. lazier　　 C. healthier

九年级英语完型填空中等难度题查看答案及解析