Mountaineers have noted that as they climb, f...

Mountaineers have noted that as they climb, for example, up to the 12,633­foot Humphreys Peak in Arizona, plant life changes greatly. In the Sonoran Desert, one climbs into a pine forest at 7,000 feet and a treeless tundra(冻土带) on the top of the mountain. It may seem that plants at a given altitude are associated in what can be called “communities” －groupings of species. The idea is that over time, plants that require particular climate and soil conditions come to live in the same places, and are frequently to be found together. Scientists study the history of plant life and build up a picture of how groups of plants have responded to climate changes and how ecosystems develop. But are these associations, which are real in the present, permanent?

A great natural experiment took place on this planet between 25,000 and 10,000 years ago, when small changes in the earth’s orbit caused great sheets of ice to spread from poles. These glaciers(冰川) covered much of North America and Europe to depths of up to two miles, and then, as the climate warmed, they retreated. During this retreat, they left behind newly uncovered land for living things to occupy, and as those living things moved in they laid down a record we can read now. As the ice retreated and plants started to grow near a lake, they release pollen(花粉). Some would fall into the lake, sink to the bottom and mix with the sand. By drilling into the lake bottom it is possible to read the record of the plant life around the lake. The fossil record seems clear; there is little or no evidence that entire groups of plants moved north together. Things that lived together in the past don’t live together now, and things that live together now didn’t live together in the past. Each individual living things moved at its own pace. The fossil record seems to be telling us that we should be thinking about preserving species by giving them room to move about－to respond to environmental changes.

1.According to the passage, the movement of individual species of plants ________.

A. occurs in groups

B. often depends upon the formation of lakes

C. does not occur in groups

D. depends upon climate and soil conditions

2. All of the following are true EXCEPT ________.

A. The ice age occurred when there were small changes in the orbit of the earth

B. fossil records seem to indicate that plants will be preserved if they have enough room to move

C. fossil records clearly show that entire groups of plants are unlikely to have moved together

D. in the ice age glaciers covered the world to depths of up to two miles

3.The underlined word “which” refers to ________.

A. the responses of plants to climate changes

B. the current theories of ecosystems

C. the development of ecosystems

D. plant life changes

4.The second paragraph is intended to ________.

A. support the main idea of the first paragraph

B. answer the question raised in first paragraph

C. make suggestions about responding to environmental changes

D. stress the importance of preserving species

高二英语阅读理解中等难度题查看答案及解析

Not many foreigners can say that they have lived in China for as long as I have. Perhaps some can hack(应对) it for about two or three years and then they want to either go back home or move on to another country. As for me, I cannot get 36 of this place. I love it here so much and I honestly believe that I am very comfortable here. It feels just like 37. And, here 38 the story.

It was August 2001 and I had just said 39 to my family and friends as I 40 to Los Angeles International Airport to catch my 41 to Incheon, South Korea which would then 42 me to Beijing. When I arrived in LA I was very excited and a little 43 because I didn't know what to 44 when I arrived in China. It 45 like receiving a wrapped gift and you had no idea what was in it 46 you opened it. As I 47 the Korean Airlines 48 desk I gave the attendant(空乘人员) my ticket. He looked at me and said, "I'm sorry, sir. This flight was yesterday." I was in 49 and lost for words. The attendant told me I had to wait several hours until they could 50 whether I could get onto another flight.

I was so afraid at this time that I called my mother and frantically(狂乱地) told her," I missed my flight! I don't think I can go to 51! I'm better off going back to Washington, DC!" That's when she 52 I call my leader in China and ask whether I could still go there. Looking 53 all of the papers I found a phone number and called the Beijing office. 54, my leader was there and assured me I could still join the group. Also, KAL had a seat for me on the next flight. So, after 24 hours and a 55 in Korea, I arrived in Beijing. I don't know what my feeling was, but I wasn't tired because I had finally arrived and I just wanted to look around the city. As I traveled to the hotel in the car I saw all the wonderful buildings, friendly people and interesting sites. I was so happy to be here.

高二英语完型填空困难题查看答案及解析

My parents had some strange rules when my sister and I were growing up．For example they never 　　　 us soda or juice．Our choice was water or iced tea 　　　 no sugar．My mom's 　　　 for it was that she didn't like kids who only drank sweet drinks，or worse，kids who did not like　　　 ! She wanted to teach us to like water or 　　　　 unsweetened drinks that did not come in a bottle．We，on the other hand，wanted to 　　　 a coke when we ate out．Now I can make my own decision，but I 　　　 choose juice or soda．I don't 　　　 it．It's not because I don't like it．I' m just used to drinking water．Many people 　　 to think that a kid needs juice．If the child can't get it，he or she will secretly buy this kind of drink elsewhere．I found this really 　　　 ，since I was raised　　　 　　 no juice or soda，and I didn't really　　　　 only having water．Now people　　 　　 　 kids to make their own choice，　　 　　 　 I grew up in a family where the children's opinions were seldom 　 　　　 for，and the parents made the final decision．

1.A．needed　　　　 B．sold　　　　　　 C．bought　　　　　 　 D．left

2.A．with　　　　　　 B．of　　　　　　　 C．off　　　　　　　 　　 D．without

3.A．decision　　　　 B．reason　　　　　 C．hobby　　　　　　 D．experience

4.A．soda　　　　　 B．juice　　　 　　 C．water　　 　　 D．milk

5.A．another　　　　 B．the other　　　 C．others　　　　　　 D．other

6.A．order　　　　　 B．reply　　　　　　 C．obey　　　　　　　 D．achieve

7.A．ever　　　　　 B．never　　　　　　 C．always　　　　　　 D．sometimes

8.A．think about　　 B．take care　　　 C．pay for　　　　　 D．think out

9.A．like　　　　　　 B．seem　　　　　　 C．study　　　　　　 D．get

10.A．excited　　　　 B．difficult　　 C．interesting　　 　　 D．necessary

11.A．on　　　　　　 B．with　　　　　　 C．for　　　　　　　　 D．by

12.A．give up　　　 B．care about　　 C．take pride in　 　　 D．agree with

13.A．allow　　　　 B．design　　　　　 C．teach　　　　　　 D．cause

14.A．as　　　　　　 B．since　　　　　 C．but　　　　　　　　 D．though

15.A．added　　　　 B．asked　　　　　　 C. influenced　　 　　 D．regarded

高二英语完形填空中等难度题查看答案及解析

My parents had some strange rules when my sister and I were growing up．For example they never 　　　 us soda or juice．Our choice was water or iced tea 　　　 no sugar．My mom's 　　　 for it was that she didn't like kids who only drank sweet drinks，or worse，kids who did not like　　　 ! She wanted to teach us to like water or 　　　　 unsweetened drinks that did not come in a bottle．We，on the other hand，wanted to 　　　 a coke when we ate out．Now I can make my own decision，but I 　　　 choose juice or soda．I don't 　　　 it．It's not because I don't like it．I' m just used to drinking water．Many people 　　 to think that a kid needs juice．If the child can't get it，he or she will secretly buy this kind of drink elsewhere．I found this really 　　　 ，since I was raised　　　 　　 no juice or soda，and I didn't really　　　　 only having water．Now people　　　　　 kids to make their own choice，　　　　　　 I grew up in a family where the children's opinions were seldom 　　　　 for，and the parents made the final decision．

1.A．needed　　　　 B．sold　　　　　　 C．bought　　　　　　 D．left

2.A．with　　　　　 B．of　　　　　　　 C．off　　　　　　　　 D．without

3.A．decision　　　　 B．reason　　　　 C．hobby　　　　　　　 D．experience

4.A．soda　　　　　　 B．juice　　　　　 C．water　　　　　　 D．milk

5.A．another　　　　 B．the other　　 C．others　　　　　　 D．other

6.A．order　　　　　 B． reply　　　　 C．obey　　　　　　 D．achieve

7.A．ever　　　　　　 B．never　　 　　 C．always　　　　　　 D．sometimes

8.A．think about　　 B．take care　 　 C．pay for　　　　　　 D．think out

9.A．like　　　　　　 B．seem　　　　　　 C．study　　　　　　　 D．get

10.A．excited　　　　 B．difficult　　 C．interesting　　 D．necessary

11.A．on　　　　　　 　 B．with　　　　　 C．for　　　　　　　　 D．by

12.A．give up　　 B．care about　 C．take pride in　 D．agree with

13.A．allow 　　　　 B．design　　　　 C．teach　　　　　　　 D．cause

14.A．as　　　　　　 B．since　　　　　 C．but　　　　　　　　 D．though

15.A．added　　　　 B．asked　　　　　 C. influenced　　　 D．Regarded

高二英语完形填空中等难度题查看答案及解析

It is very common that many students complain they lack concentration. For example ,“I can’t concentrate.” “My mind wanders when I try to study.”

We all have the ability to concentrate. Think of the times when you were attracted to a super novel or the times when you were playing your guitar or piano. But at other times your mind races from one thing to another. Here are some tips.

Rest from time to time. Remember to take short breaks. Lectures are usually 50 minutes long, and that’s about the length of time most people can direct their attention to one task. But that’s just an average. Your concentration time might be shorter (20-35 minutes) or longer (perhaps 90 minutes). When you take a break, you get more oxygen to your brain! When we sit for long periods, blood tends to be pooled in our lower body and legs. Get up and walk around the room for a couple of minutes. As a result, more oxygen is carried to the brain and you can concentrate better.

If you study one subject for a long time, you may find it hard to concentrate. Many students improve their concentration by changing one subject to another every one to two hours. In this way you can pay more attention to something that’s different.

Reward yourself. Give yourself a reward when you’ve completed a task. The task might be small, such as staying with a difficult paper until you’ve finished. But giving yourself a reward can help you be more interested in doing other tasks.

Increase your activity level. Your concentration wanders more easily if you just read an article straight through. Instead, take the heading for each part and turn it into a question. For this part, that would be, “How can I increase my activity level while studying?” Then study that part to answer that question. Do this routinely. The questions give us a focus for each part and increase our involvement (参与).

1.According to Paragraph 3, what’s the purpose of walking around?

A.To help us stay fit.

B.To provide the brain with more oxygen

C.To benefit our lower body.

D.To increase our concentration time to 90 minutes.

2.What’s the best title for Paragraph 4?

A.Study for one hour each time.

B.Do something difficult.

C.Change subjects.

D.Study in different ways.

3.In the last paragraph, the writer suggests that______.

A.we just read the heading of some articles

B.we do our best to read an article straight through

C.we ask other people questions about the article we are reading

D.we ask ourselves questions about what we are reading

4.The writer wrote the passage to______.

A.encourage us to try to concentrate

B.give us the reasons for a lack of concentration

C.teach us how to concentrate while studying

D.list the benefits we can get from concentration

高二英语阅读理解简单题查看答案及解析

Psychologists(心理学家) have known that what's going on inside our head affects our senses. For example, poorer children think coins are larger than they are, and hungry people think pictures of food are brighter. Professor Remi Radel wanted to investigate(look into) how this happens -- whether it's right away, as the brain receives signals from the eyes, or a little later, as the brain's higher-level thinking processes get involved.

Radel chose 42 students and each student was told to arrive at the lab at noon after three or four hours of not eating on the day of the test. Then they were told there was a delay. Some were told to come back in 10 minutes; others were given an hour to get lunch. So half the students were hungry when they did the experiment and the other half had just eaten.

For the experiment, the participant looked at a computer screen. One by one, 80 words flashed on the screen. A quarter of the words were food-related. After each word, the person was asked how bright the word was and asked to choose which of two words they'd seen -- a food-related word like gateau (cake) or a neutral (中性的) word like bateau (boat).

Hungry people saw the food-related words as brighter and were better at identifying food-related words. Because the word appeared too quickly for them to be reliably seen, this means that the difference is in perception (直觉), Radel says—it's not because of some kind of processing happening in the brain after you've already figured out what you're looking at.

"This is something great to me, that humans can really realize what they need or what they hope for, to know that our brain can really arrange for our motives and needs," Radel says. "There is something inside us that selects information in the world to make life easier.”

1.The purpose of Radel's research is to let us know ____.

2.In the experiment 20 words that flashed on the screen had something to do with “____”.

3.Which of the following is true about the experiment?

4.What does the new study find?

高二英语阅读理解中等难度题查看答案及解析

Most people look forward to retirement as a time when they can finally take up activities that they never had the time or energy to pursue before. Bust some recent studies on people in their golden years are disturbing: they suggest that retirees are more likely to suffer from depression and possibly higher rates of other diseases such as heart disease and high blood pressure. That’s why a new study of French workers is welcome news.

Led by Hugo Westerlund, a professor of psychology at Stockholm University, the study of more than 14,000 workers found lower rates of depression and fatigue(疲劳) in people after they got tired while they were still employed.

The scientists followed the employees of the French national gas and electric company for 14 years. They found in the year immediately after retirement, the volunteers reported 40% fewer depressive symptoms than they had in the year before their retirement. The researchers also found an 81% drop in reports of both mental and physical fatigue over the same time period.

Clearly, said Westerlund, much of these decrease in physical and mental fatigue can be traced back to relief from the stresses of work. The decline in depressive symptoms suggests that retirement may be having a positive mental effect, too, which may have a lot to do with the generous pensions(养老金) that French workers enjoy. Most retirees in that country still benefit from about 80% of their yearly salaries.

“The economic or financial situation in retirement is very important,” Westerlund says. “We don’t know if the decrease in fatigue and depressive symptoms is because of the removal of something bad while in work or the addition of something good while in retirement. But no matter the reason, if life in retirement is not comfortable, then we won’t see the improvements we did.”

However, in European nations like France, governments are considering changes to pension plans, which may affect retirees’ health after they leave their jobs—with less of a financial safety net, workers may no longer seem so mentally and physically happy to be out of work.

(Note: Answer the questions or complete the statements in NO MORE THAN TEN WORDS)

1.According to some recent studies, retired people may have depression and higher rates of other disease like ____________________________________.

2.Westerlund’s group found that in the year just after the retirement most retired French workers felt much less tired both __________________________________.

3.What dies the word “improvements” in paragraph 5 refer to?

_______________________________________________________________

4.Retirement may make people happier with ___________________________________

高二英语阅读理解困难题查看答案及解析

Grown-ups are often surprised by how well they remember something they learned as children but have never practiced ever since. A man who has not had a chance to go swimming for years can still swim as well as ever when he gets back in the water. He can get on a bicycle after many years and still ride away. He can play catch and hit a ball as well as his son. A mother who has not thought about the words for years can teach her daughter the poem that begins "Twinkle, twinkle, little star" or remember the story of Cinderella or Goldilocks and the Three Bears.

One explanation is the law of overlearning, which can be stated as follows: Once we have learned something, additional learning trials increase the length of time we will remember it.

In childhood we usually continue to practice such skills as swimming, bicycle riding, and playing baseball long after we have learned them. We continue to listen to and remind ourselves of words such as "Twinkle, twinkle, little star" and childhood tales such as Cinderella and Goldilocks. We not only learn but overlearn.

The multiplication tables（乘法口诀表）are an exception to the general rule that we forget rather quickly the things that we learn in school, because they are another of the things we overlearn in childhood.

The law of over learning explains why cramming（突击学习）for an examination, though it may result in a passing grade, is not a satisfactory way to learn a college course. By cramming, a student may learn the subject well enough to get by on the examination, but he is likely soon to forget almost everything he learned. A little overlearning, on the other hand, is really necessary for one's future development.

1.What is the main idea of paragraph 1?

A.People remember well what they learned when they were little.

B.Children have a better memory than grown-ups.

C.Poem reading is a good way to learn words.

D.Stories for children are easy to remember.

2.The author explains the law of overlearning by_________.

A.presenting research findings B.setting down general rules

C.making a comparison D.using examples

3.According to the author, being able to use multiplication tables is_______.

A.a result of overlearning B.a special case of cramming

C.a skill to deal with math problems D.a basic step towards advanced studies

高二英语阅读理解中等难度题查看答案及解析

Don’t _____ women. They are as important as men for the development of society.

A. look up to　　　　　 B. look down upon

C. look out for　　　 D. look forward to

高二英语单项填空中等难度题查看答案及解析

Your teen is falling asleep in class

Teens have a busy morning schedule as they need to wake up and get moving very early in order to catch a bus and get to school by the required time. This means teens need to get their rest the night before or they will be too tired to learn anything at school.　 1.

When a teen falls asleep in class, two things happen: he/she misses what is being taught and he/she loses the respect of the teacher. He/She may also receive a consequence from the school, depending on the classroom discipline policy.　 2.

To prevent your teen from being sleepy in class, try these three tips:

* Set a time for “lights out” on school nights. This is never be any later than 10 p. m. and preferably 9 p.m.　 3. Soft music can be on and used to help calm your teen.

* Help your teen develop a nighttime routine that involves activities that slow them down for the end of the day.　 4. Turning off the computer and disconnecting from friends and the excitement of the day an hour before bedtime will also help your teen relax.

* 5.　 This will reinforce （增强）what it feels like to be rested and capable of accomplishing what he/she wants.

A. What’s worse, they may even fall asleep in class.

B. Taking a bath and reading are two activities that work well.

C. Set a good example and show him/her your love for learning.

D. Point out the positives after your teen has had a good night’s rest.

E. All of these things affect your teen’s academic success and can be avoided.

F. “Lights out” means the computer, television, lights and cell phone should be off.

G. While your teen keeps his/her goals in line with your expectations, he/she may have his/her own goals.

高二英语七选五中等难度题查看答案及解析