Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.

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问题 Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.

选项 A、determined
B、argued
C、hypothesized
D、griped

答案A

解析 ascertain查明，确定，弄清。determine决定；确定。argue争论；主张。hypothesize假设，假定。grip理解，掌握；紧握。

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