2. 专升本
  3. Solar cells have been developed primarily to ________ electric power for spacecraft.

Solar cells have been developed primarily to ________ electric power for spacecraft.

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问题 Solar cells have been developed primarily to ________ electric power for spacecraft.
选项 A、seek
B、provide
C、apply
D、insure
答案B
解析 provide electric。power for spacecraft为宇宙飞船提供动力；seek作“寻求”；apply作“应用”；insure为“给……保险”。句意：太阳能电池的主要用途是为航天器提供电力。
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