问题
选择题
Exploring _____space is exciting, yet dangerous.
There is _____need for both robots and humans for space exploration.
A.the; a
B.a; a
C./; a
D./; the
答案
答案: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。