题目内容

Pigeons have a natural instinct to return home, ____ they are very far away and the trip is hard or dangerous（）

A. after all
B. by all means
C. in particular
D. even if

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Nature’s recycling system can work well only if people work with the system, ____ against it（）

A. in addition to
B. on the whole
C. rather than
D. as a result

Water management is particularly important. In some parts of Africa, ____, digging deep wells for clean drinking water can support many generations（）

A. without doubt
B. therefore
C. for example
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A. give up to
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A. the pros of human cloning
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