Unit 5 Into the wild

Section Ⅰ Starting out & Understanding ideas

基础训练

单词拼写 根据首字母或汉语提示，用本部分所学单词的正确形式填空。

1. The s_______________ to the problem is not perfect but no one can come up with a better one at the moment.

2. The number of wild animals in the world c_______________ by about 60％ in the past 40 years.

3. The a_______________ expression on her face suggested she had not heard the news.

4. As English is important for us today， Tim d_______________ to try hard to improve his English.

5. The war would d_______________ a city， and life would be hard for people then.

6. _______________ （慈善机构） is an organization that helps people in need.

7. His _______________ （每年的） production of this year is twice as much as that of last year.

8. The man is trying to _______________ （寻找） an opportunity to show his ability to the manager.

9. We must _______________ （测量） the room to get the exact size of it.

10. Beidou Navigation Satellite System （BDS） can help you find your _______________ （位置）.

选择填空 用方框中所给短语的适当形式填空。

manage to the solution to cut down feed on make sure

1. It is our duty _______________________ that the students on campus are taken good care of.

2. As we all know， bats fly at night and _______________________ insects or fruits.

3. They _______________________ catch sight of some mountain goats on this trip.

4. The team are working very hard so that they can find _______________________ the problem.

5. The government ordered that for every tree _______________________ two more be planted.

课文语法填空

Many animals migrate at certain times of the year. One of the most wonderful migrations in nature is ____1____ of the North American monarch butterfly. Every autumn， they begin ____2____ long and difficult journey around 4，000 kilometers south and find their way to California or Mexico. They are able to tell the time of day and use their eyes ____3____ （measure） the position of the sun. ____4____ （eventual）， they reach the places where they will spend the winter. Now the monarch is ____5____ serious trouble， and its population ____6____ （crash） by as much as 90 percent in the last few years. Human activity is the main reason. In many of the ____7____ （place） where the butterfly can ____8____ （find）， people are destroying the natural environment by ____9____ （cut） down trees and using chemicals that kill the plants that monarch caterpillars eat. Luckily， people are aware of the problem and begin to take action. The more we know about the monarchs， the ____10____ （great） the chance they will survive.

1. _______________  2. _______________  3. _______________  4. _______________  5. _______________

6. _______________  7. _______________  8. _______________  9. _______________  10. _______________

能力提升

阅读理解

Cuckoos （布谷鸟） are masters of cheating. When it comes to raising young， they don’t spend the energy building a nest， protecting eggs or feeding children. Instead the female passes these roles on to other birds. They don’t raise their own young. Usually， they lay their eggs in the nests of other birds， fooling other birds into thinking the cuckoo eggs are theirs.

To succeed in doing this， a female cuckoo watches over her chosen nest to observe feeding times. When the host parent leaves its nest in search of food， the cuckoo quickly lays her eggs among those already in the nest. Sometimes， she will even destroy and remove one of the host’s eggs to make room for her own.

Cuckoos are medium-sized birds with long tails， and often have gray or brown backs. When they hatch （孵化） and begin to grow in a host’s nest， the difference between the two can be obvious to an onlooker. Often the cuckoo is twice the size of its host parents， but still continues to receive food from them.

The cuckoo imposter （冒名顶替者） is usually the only baby bird that the host parent has to care for. This is because when the cuckoo hatches after around 11 days， it gets rid of all the other eggs in the nest. It will lift each egg onto its back before throwing them one by one over the edge of the nest. Even then， the non-biological parent will continue to treat it as one of its own.

Also， cuckoos have developed to produce eggs that are similar in color to their main hosts’. This reduces the chances of eggs being attacked. Female cuckoos have been known to take host birds’ attention away after laying their eggs by producing a noise similar to Eurasian sparrowhawks， scaring birds away from returning to the nest and allowing time for the cuckoo to make her escape unnoticed.

1. What do mother cuckoos usually do when it comes to raising their young？

A. Attend to eggs. B. Build a new nest. C. Rely on other birds. D. Learn feeding skills.

2. What does the underlined word “them” in Paragraph 3 refer to？

A. Other cuckoos. B. Baby cuckoos. C. Its host parents. D. Its birth parents.

3. What can be inferred about the cuckoo imposter？

A. It looks much larger than the other eggs.