2. 外语
  3. Machines need energy (to function), (whether) it is animal or human muscle, wind or (waters) currents, or heat-generated energy,

Machines need energy (to function), (whether) it is animal or human muscle, wind or (waters) currents, or heat-generated energy,

admin2004-12-30  48
问题 Machines need energy (to function), (whether) it is animal or human muscle, wind or (waters) currents, or heat-generated energy, (such as) steam.
选项 A、to function
B、whether
C、waters
D、such as
答案C
解析
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