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  3. Earth is the only【C1】________we know of in the universe that can support human life. 【C2】________human activities are making the

Earth is the only【C1】________we know of in the universe that can support human life. 【C2】________human activities are making the

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问题     Earth is the only【C1】________we know of in the universe that can support human life. 【C2】________human activities are making the planet less fit to live on. As the western world【C3】________on consuming two-thirds of the world’s resources while half of the world’s population do so【C4】________to stay alive. We are rapidly destroying the【C5】________resource we have by which all people can survive and prosper. Everywhere fertile soil is【C6】________built on or washed【C7】________the sea. Non-renewable resources are exploited so much that they will never be able to recover【C8】________.We discharge pollutants into the atmosphere without any thought of the consequences. As a【C9】________the planet’s ability to support people is being【C10】________at the very time when rising human numbers and consumption are【C11】________increasingly heavy demands on it.
    The Earth’s【C12】________resources are there for us to use. We need food, water, air, energy, medicines, warmth, shelter and minerals to【C13】________us fed, comfortable, healthy and active. If we are sensible in how we use the resources they will【C14】________indefinitely. But【C15】________we use them wastefully and excessively they will soon run out and everyone will suffer.
【C15】
选项 A、if
B、whether
C、what
D、how
答案A
解析 此句与前面的if句并列，但意思相反。如果过量使用，资源将会枯竭。选项A是正确的。
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