Laboratory work is your chance to learn scien...

Laboratory work is your chance to learn science first-hand. It can be fun but you must be careful to prevent injury. Listen closely when your teacher reads and explains the rules before your first lab lesson.

1.Your teacher will probably tell you the rules above ________ the first lab lesson.

A. before            B. since            C. during           D. after

2.Before every experiment, you should ________.

A. taste the chemicals first

B. clean all the apparatus

C. read all instructions carefully

D. report all the accidents to the teacher

3.When you are not sure how to use all apparatus, ________.

A. try them on your own                  B. put them back

C. ask your teacher for help                 D. read the rules carefully

4.It is clear that you can ________.

A. bring food into the lab

B. enter the lab anytime

C. smell chemicals as you like

D. learn science directly in the lab

5.If you get chemicals on the clothing, you can find ways to solve it in the part ________.

A. Before the Experiment                 B. First Aid

C. During the Experiment                 D. After the Experiment

九年级英语阅读理解困难题查看答案及解析

Laboratory work is your chance to learn science first—hand. It can be fun but you must be careful to prevent injury.

Listen closely when your teacher reads and explains the rules before your first lab lesson.

根据材料内容选择最佳答案，并将其标号填人题前括号内。

1. Your teacher will probably tell you the rules above ______ the first lab lesson.

A. before B. since C. during D. after

2. Before every experiment, you should ______ .

A. taste the chemicals first

B. clean all the apparatus

C. read all instructions carefully

D. report all the accidents to the teacher

3.When you are not sure how to use the apparatus, you should ______ .

A. try them on your own

B. read the rules carefully

C. ask your teacher for help

D. put them back

4.It is clear that you can ______ .

A. bring food into the lab

B. enter the lab any time

C. smell chemicals as you like

D. learn science directly in the lab

5. If you get chemicals on the clothing, which part can you find ways to solve it?

A. Before the experiment B. First aid

C. During the experiment D. After the experiment

九年级英语阅读理解中等难度题查看答案及解析

Laboratory work is your chance to learn science firstly. It can be fun, but you must be careful to avoid hurting.Listen closely when your teacher reads and explains the rules before your first lab lesson.

1.Your teacher will probably tell you the rules above __________ the first lab lesson.

A. before　　　　　　　　 B. since　　　　　　　　 C. during　　　　　　　 D. after

2.It’s clear that you can _______________

A. bring food into the lab

B. enter the lab anytime

C. smell chemicals as you like

D. learn science directly in the lab

3. If you get chemicals on your clothes, which of the following ways can you find to solve it?

A. Before the experiment　　　　　　　　　　　　 B. First aid

C. During the experiment　　　　　　　　　　　　 D. After the experiment

九年级英语阅读理解中等难度题查看答案及解析

Laboratory　work　is　your　chance　to　learn　science　firsthand.　It　can　be　fun　but　you　must　be　careful　to　prevent　injury.　Listen　closely　when　your　teacher　reads　and　explains　the　rules　before　your　first　lab　lesson.

LABORATORYRULES

Throughout　the　lesson

·Do　not　enter　the　science　lab　without　the　teacher’s　permission.·No　food　or　drinks　are　to　be　alowed　in　the　science　lab.

Before　the　Experiment

·Read　al　instructions　carefuly　before　every　experiment.

·Prepare　al　apparatus（仪器）and　arrange　them　so　that　you　wil　not　knock　them　over　while　doing　the　experiment.

During　the　Experiment

·If　you　are　unsure　of　how　to　use　any　apparatus　or　how　to　operate,　ask　your　teacher　for　help.·Never　smel　or　taste　chemicals　unless　your　teacher　gives　permission.

After　the　Experiment

·Wash　al　apparatus　after　use　and　return　them　to　the　places　where　they　were.

·Throw　waste　materials　in　proper　waste　baskets.　　　First　Aid　　　

·Report　al　accidents　to　your　teacher　immediately.

·If　you　spil（ 溅 出 ）any　chemicals　onto　your　body　or　clothing,　wash　with　plenty　of　water　and　report　to　your　teacher.

1.　Your　teacher　wil　probably　tel　you　the　rules　above　_____　the　first　lab　lesson.

A.　before　　　　B.　since　　　C.　during　　　D.　after

2.　Before　every　experiment,　you　should　_____.

A.　taste　the　chemicals　first

B.　clean　al　the　apparatus

C.　read　al　instructions　carefuly

D.　report　al　the　accidents　to　the　teacher

3.　When　you　are　not　sure　how　to　use　al　apparatus,　_____.

A.　try　them　on　your　own

B.　read　the　rules　carefuly

C.　ask　your　teacher　for　help

d.　put　them　back

4.　It　is　clear　that　you　can　_____.

A.　 bring　food　into　the　lab

B.　enter　the　lab　anytime

C.　smel　chemicals　as　you　like

D.　learn　science　directly　in　the　lab

5.　If　you　get　chemicals　on　the　clothing,　you　can　find　ways　to　solve　it　in　the　part　_____.

A.　Before　the　Experiment

B.　First　Aid

C.　During　the　Experiment

D.　After　the　Experiment

九年级英语阅读理解中等难度题查看答案及解析

_____ this is your first visit to New York, you’d better learn some of the customs.

A. Unless 　 　　 B. Since 　　 C. Although 　 D. Until

九年级英语单项填空中等难度题查看答案及解析

Hand in a drawing of your favorite place in school and get a chance to win PRIZES!

Your drawing may be a picure of the gate,the dining hall,the field,the classroom or even the toilet!

Along with your picture,include a short description(3—5sentences)explaining why that place is special for you!

All winning picture will be on show outside the school hall for the whole month of June!

1st prize--$100

2nd prize --$70

3nd prize -$50

5 Comfort prizes of $30 each

Your picture can be either or black-and-white.All drawings must be handed in to your Art teacher by May 30,2015.

All LCPS students are encouraged to join!

Organized by:

Lion City Primary School (LCPS)　　　　 Prizes sponsored(赞助)by:

（Art Department）　　　　　　　　　　 Lucky Books and Stationery

1.Which of the following would be a proper picture for the competition?

2.Besides your picture, you must write about _____.

A.why you like the place so much

B. why drawing is your favorite hobby

C. whether you think you can win

D. when you started learning to draw

3.According to the ad（广告）, all winners can get ____.

A.a $100 prize B. a $70 prize

C. a favorite place in school D. their pictures on show

4.The competition is organized by ___________.

A.an Art teacher B. LCPS Art Department

C. the headmaster D. Lucky Books & Stationery

九年级英语阅读理解中等难度题查看答案及解析

More chances _____ for students to learn from each other if working in groups.

A. provide　　　　　　 B. are provided

C. provided　　 　　 　 D. will provide

九年级英语单项填空中等难度题查看答案及解析

More chances _____ for students to learn from each other if they work in groups.

A. provide　　　　　　 B. are provided　　　　　 C. provided　　　　 D. will provide

九年级英语单项填空中等难度题查看答案及解析

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

—Why did your uncle finally______ such a good chance to work abroad?

—Because he wanted to do more for our country.

A. look up　　 B. make up　　 C. give up　　 D. use up

九年级英语单项填空中等难度题查看答案及解析