问题
选择题
Scientists are now working _ humanoids(类人生物) because they can help people a lot. [ ]
A. on
B. against
C. into
D. to
答案
答案：A
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Scientists are now working _ humanoids(类人生物) because they can help people a lot. [ ]
A. on
B. against
C. into
D. to
答案：A