Question

【题目】The physics teacher once said that as __________ well-known, thunders __________ make electricity.

A. is; can B. was; could

C. was; should D. be; can

Answer 1

【答案】A

【解析】句意：物理老师曾经说过，众所周知,雷能发电。as is well-known众所周知；can表示理论上的可能性。