The solar cell can convert the energy of sunlight into (electric) energy.
A. 水力的
B. 电力的
C. 风力的
D. 核的
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He is indifferent to the (result) of the exam.
A. 结果
B. 过程
C. 开始
D. 难度
A person's behavior is often (regulated) by his circumstances.
A. 打击
B. 鼓励
C. 偏离
D. 规范
he is writing a letter of (apology).
A. 10
B. 申请
C. 交换
D. 辞职
words cannot （express） my thanks
A. 10
B. 生产
C. 快速的
D. 表达
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