4: If you’re into sports, you’ve seen it happen—tennis players jump over the net to shake hands after a hard match; football players exchange jerseys（运动衣）after ninety minutes of knocking each other around; even boxers touch g...

2: There was once a millionaire who loved money than anything else in the world. He didn’t know exactly how much he had, so he took on a little girl to ## all his money for him. It ## the little girl six days to count all th...

15: The heavy rain stopped the children ______ to the park. A: to go B: gone C: from going D: go ...

18: How long may I _______ the book ? A: borrow B: want C: take D: keep ...

1: He was struggling to tie his shoes. I was struggling with whether I should help him. I did, and he was grateful. “Thank you,” he said. “I’m glad I could help. I just thought it would be easier for me to reach,” I said. ...

3: When I got to his home, he ________ for an hour. A: had left B: left C: had been away D: has been away ...

16: Zhang Ming is good ______ Chinese. He often helps ______ it. A: is, me with B: at, I wish C: at, me with D: on, I in ...

30: He's worked here _______ 4 o'clock this afternoon. A: for B: at C: since D: about ...

14: 若p1 = 2p2，则： 和 某卡诺热机，低温热源温度为27°C，效率为40%。其高温热源的温度为T； 若想将效率提高到50%且保持低温热源的温度不变，高温热源的温度需增加ΔT则有： A: T = 600K；ΔT = 100K。 B: T = 500K；ΔT = 200K。 C: T = 500K；ΔT...

16: 在热力学中，“作功”和“传递热量”都能使系统的内能发生变化，但它们有本质的区别。下述说法正确的是： A: 作功是把力转变成热力学系统的内能；而传热是把一个系统的热量转变成另一个系统的内能。 B: 作功是把宏观的运动转变成热力学系统的内能；而传...