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

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

admin2011-03-26  79
问题 Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.
选项 A、determined
B、argued
C、pretended
D、hypothesized
答案A
解析
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