Biologists have
ascertained
that specialized cells convert chemical energy into mechanical energy.
A、
determined
B、
argued
C、
pretended
D、
hypothesized
【正确答案】
A
【答案解析】
解析:题干中ascertained“确定”,选项中determine“决定”,argue“争论”,pretend “假装”,hypothesize“假设”,选项A最接近题干意思。
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