(单选题)23: He's worked here _______ 4 o'clock this afternoon. A: for B: at C: since D: about ...

(单选题)17: The teacher required that all the assignments _____finished before this weekend. A: would be B: were C: be D: are to ...

(单选题)11: -- Is Mr Smith really very ill? --________. He's in hospital. A: I don't think so B: No, he isn't C:  I hope so D: I'm afraid so ...

33:      Why do you think people who live in some hot countries eat very spicy(辛辣的)food? Is it because the spices make the food taste better? Is it just because their parents and grandparents and great-grandparents li...

(单选题)27:  My friend, Tom, kept me _______ for an hour yesterday.　 A: to wait B: waited C: waiting D: wait ...

(单选题)15: They worked hard to _____their small business into a large one. A: transform B: transition C: transit D: transport ...

(单选题)9: It may rain tomorrow, but we are going home_____. A: however  B: in any case C: still  D: no matter ...

(单选题)17: 给同一汽车轮胎打气，使之达到同样的压强。对在冬天和夏天打入轮胎内的空气的质量（设冬天和夏天轮胎的容积相同），下面说法正确的是： A: 冬天和夏天打入轮胎中空气的质量相同。 B: 冬天打入的质量多，夏天打入的质量少。 C: 冬天打入的质量...

(单选题)11: 对一定量的理想气体，其温度确定以后，关于它的内能，下面说法正确的是： A: 压强越大，体积越大，内能就越大。 B: 压强越大，体积越小，内能就越大。 C: 压强越小，体积越大，内能就越大。 D: 气体的内能与压强和体积无关。 ...

(单选题)1: 把电荷由A点移到B点时下述说法正确的是： A: 若把正电荷由A点移到B点外力克服电场力作正功，则A点比B点的电势低；若把负电荷由A点移到B点时，电场力作正功，则A点也比B点的电势低。 B: 若把正电荷由A点移到B点外力克服电场力作负功，则A点比B点...