Plants and animals usually do not live apart, as in many ways they are important to each other. Most green plants can make their own food. The food of other living things, even the food of meat-eating animals, comes directly or indirectly from green plants. For example, some people eat mutton (羊肉); mutton comes from a goat; the goats eat grass. These steps, or links, make up what is called a food chain. Without green plants, all other living things would in time die of starvation.
Plants help animals in other ways too. They furnish homes and shelter for many animals. Many birds, as you know, build their nests in trees. Deer and many other animals use bushes for shel­ter. And even man depends much upon plants for his shelter. Animals repay some of this debt by helping plants. You may be aware that many insects and some birds do important work for plants by pollinating (授粉) them. You must have also learned how animals often help plants by spreading seeds.
What is waste material for one of these kinds of life is often valuable substance for the other. For example, animals give off carbon dioxide gas when they breathe. When plants make food, they absorb this gas from the air, using the carbon and releasing some of the oxygen back into the air. The oxygen that is released, then, is again supplied to animals. Thus the cycle continues, ani­mals helping plants, and plants helping animals.
All plants and animals have their enemies. Insects eat plants; birds eat insects; other animals kill birds. But here too, animals such as birds and bats help the plants by destroying harmful in­sects. Many plants and animals are helpful to some living things but are harmful to others. Then there are other rules in nature that act as checks and balances. For example, if there are more animals in a certain area than there is food to support them, some of the animals must mi­grate or starve. In either case, the number of animals will be reduced until the balance between animals and the available food supply is restored.
These helps and hindrances (障礙) are constantly going on in the plant and animal world to achieve a balance. As long as one living thing is dependent on another, whenever the scales are tipped (使傾斜), nature takes steps to balance the scales again.
 (Note: Answer the questions or complete the statements in NO MORE THAN TEN WORDS.)
小題1:What does the author mean by saying “Plants and animals usually do not live apart”?
小題2:Besides providing food and shelter for animals, plants can also ______ to help animals to live.
小題3:“Checks and balances” refers to ______ in the world of animals and plants.
小題4:What will be the final result if some animals migrate or starve for lack of food?

小題1:They are important to each other. / They depend on each other.
小題2:release oxygen
小題3:helps and hindrances that are going on
小題4:Their / Animal number will be reduced until the balance is restored.

試題分析：
小題1:從文章的第一句話Plants and animals usually do not live apart, as in many ways they are important to each other. 可知答案是They are important to each other. / They depend on each other.
小題2:從第二段的句子：animals give off carbon dioxide gas when they breathe. When plants make food, they absorb this gas from the air, using the carbon and releasing some of the oxygen back into the air. The oxygen that is released, then, is again supplied to animals可知植物可以釋放氧氣：release oxygen
小題3:從第四段的句子：These helps and hindrances (障礙) are constantly going on in the plant and animal world to achieve a balance.可知答案是helps and hindrances that are going on
小題4:從第三段的句子：some of the animals must mi­grate or starve. In either case, the number of animals will be reduced until the balance between animals and the available food supply is restored.可知答案是 Their / Animal number will be reduced until the balance is restored.
點(diǎn)評(píng)：閱讀表達(dá)的題目要根據(jù)文章的內(nèi)容進(jìn)行回答，有的是細(xì)節(jié)題，到相關(guān)的段落尋找關(guān)鍵句，得出答案，還有推理題，要根據(jù)相關(guān)的句子找出作者想要表達(dá)的意思，考查學(xué)生的理解力。
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科目：高中英語(yǔ) 來(lái)源：不詳 題型：完形填空

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小題2:Why did the teacher give him a F”?                    (No more than 14 words)
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[1]Some people's ears produce wax like busy little bees. This can be a problem even though earwax appears to serve an important purpose. Experts say it protects and cleans the ear. It traps dirt and other matter and keeps insects out. Doctors think it might also help protect against infections. And the waxy oil keeps ears from getting too dry.
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