(判断题)26: 继电器是一种根据输入信号变化，实现自动控制和保护的电器。（ ） A: 错误 B: 正确 ...

(单选题)23: It is pretty well understood _________ controls the flow of carbon dioxide in and out the atmosphere today. A: that B: when C: what D: how ...

(单选题)19: They will never succeed, _____ hard they try. A: because B: however C: when D: since ...

(单选题)7: The thief _____ in from the kitchen window as all the other windows and doors were closeD. A: may climb B: must have climbed C: could climb D: should have climbed ...

(单选题)1: The suggestion has been made _____ the basketball game _____ put off. A: for; to B: that; be C: which; should be D: to; being ...

(单选题)2: There’s a feeling in me ___________ we’ll never know what a UFO is. A: What B: which C: of which D: That ...

(单选题)21: He is working hard, ______will make him pass the final exam. A: that B: which C: for which D: who ...

(单选题)15: Read it aloud _____ the class can hear you. A: so that B: if C: when D: although ...

(单选题)3: The teacher demanded that the exam _____ before eleven. A: must finish B: would be finished C: be finished D: must be finished ...

(单选题)22: The thief _____ in from the kitchen window as all the other windows and doors were closeD. A: may climb B: must have climbed C: could climb D: should have climbed ...