(单选题)18: Mrs. Wu told me that her sister___________. A: left about two hours before B: would leave about two hours before C: has left about two hours ago D: had left about two hours before ...
(单选题)12: Do you know the man _______? A: whom I spoke B: to who spoke C: I spoke to D: that I spoke ...
(单选题)6: You must do something to prevent your house _______. A: to be broken in B: from being broken in C: to break in D: from breaking in ...
(单选题)25: It is important to communicate( ) others. A: to B: with C: in D: at ...
(单选题)20: He tried to avoid ( ) her. A: see B: to see C: seeing D: seen ...
(单选题)14: Health problems are closely connected with bad eating habits and a _____ of exercise. A: limit B: lack C: need D: demand ...
(单选题)8: Lucy often ( ) about the bad condition. A: explains B: tells C: speaks D: complains ...
(单选题)2: —I’m sorry for losing your book. I will buy a new one for you. —________. I have another copy. A: Thank you B: Happy to hear that C: Never mind D: Of course ...
(单选题)21: 电荷分布在有限空间内,则任意两点P1、P2之间的电势差取决于() A: 从P1移到P2的试探电荷电量的大小; B: P1和P2处电场强度的大小; C: 试探电荷由P1移到P2的路径; D: 由P1移到P2电场力对单位正电荷所作的功。 ...
(单选题)15: 人造地球卫星沿椭圆轨道围绕地球运动,在运动过程中,卫星的动量() A: 守恒 B: 不守恒 ...