问题
选择题
If you want to walk on the moon, you must _______ a space helmet. [ ]
A. put up
B. wear
C. dress up
D. put on
答案
答案：B
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If you want to walk on the moon, you must _______ a space helmet. [ ]
A. put up
B. wear
C. dress up
D. put on
答案：B