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Exploring _____space is exciting, yet dangerous.
There is _____need for both robots and humans for space exploration.
A.the; aB.a; aC./; aD./; the
C
该题考查冠词的用法。本题中space是不可数名词,此前不可加冠词;need是可数名词,此处表示泛指,所以要用不定冠词。因此该题最佳答案是C。
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