Questions 27-30For each question only ONE of the choices is correct. Write the

游客2024-01-09  32

问题 Questions 27-30
For each question only ONE of the choices is correct. Write the corresponding letter in the appropriate box on your answer sheet.
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选项 A、are not as reliable as electricity from the national power grid.
B、require skill to use.
C、only provide four hours of light a day.

答案 C

解析
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