题目内容：
请在（61）处填上最佳答案。
A．experiments B．checks
C．discoveries
D．works
参考答案：
答案解析：
单选题：请在（61）处填上最佳答案。
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B．checks
C．discoveries
D．works
B．checks
C．discoveries
D．works
空间站的6位宇航员轮流值班和休息，值班岗位有2个，在30个小时里，平均每位宇航员休息了（ ）小时。
空间站的6位宇航员轮流值班和休息，值班岗位有2个，在30个小时里，平均每位宇航员休息了（ ）小时。 A．25 B．20 C．15 D．10
What did Ethan Sims make his subjects do? A. Battle their ge
What did Ethan Sims make his subjects do? A. Battle their genetic inheritance.B.
What did Jules Hirsch do in his study? A. He let the eight f
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He rolled up his trouser leg to exhibit his wounded knee.A．spread B．open C．show