The phrase 'put on their thinking caps' (Line 5, Paragraph 2) most probably means
A.try to solve problems.
B.risk their proposals.
C.strive to delay the events.
D.deserve economic and military musclE.

A.try
B.
B.risk
C.
C.strive
D.
D.deserve

【参考答案】

A
解析：本题是一道词汇题，'put on their thinking caps'是一个固定表达法，其含义是'......

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