2. 外语
  3. The cells (电池) were designed to______sunshine to electricity to run a motor.

The cells (电池) were designed to______sunshine to electricity to run a motor.

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问题 The cells (电池) were designed to______sunshine to electricity to run a motor.
选项 A、convert
B、alter
C、modify
D、exchange
答案A
解析 本题是说这种电池被设计成把太阳能转化为电能来驱动马，达。A项中，convert(into／to)v．(使)转变为，(使)转化为(如to convert cotton into cloth；to convert defeat into victory；to convertwater into steam；This seat converts easily into a bed)，符合题意。其他三项中，alter vt．“改变，变更”(直接跟宾语，不跟介词to／into)；modify vt．“修改，更改”(不跟介词to／into)；exchange(for)vt．“交换，调换”(exchange A for B“用A交换B”；exchange seats with sb．“与某人交换座位”)，都与题意不符。
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