29．---Waiter! How soon can I get my food? I just have half an hour left before my train leaves.

　 ---It　　　 be ready in five minutes.

　　　 A．may　 B．should　　　 C．could D．need

28．If the drought　　　 in Southwest China, the crops will be ruined. Worse still, both people and animals will be threatened with a lack of drinking water.

　　　 A．keep to　　 B．deeps up　 C．keeps off　 D．deeps down

27．The present financial crisis has greatly contributed to thousands of workers　　　 and many factories　　　　　 .

　　　 A．laying off, closed down　 B．laid off, closed down

　　　 C．laid off, closing down　　 D．being laid off, closing down

26．Many animals sleep a lot when young, but sleep much less when they get older, just　　　 is the case with human being.

　　　 A．as　　 B．which　　　 C．what D．it

25．---Do you mean to play the hero in the play?

　 ---　　　　　 . But it should be a character I like.

　　　 A．Not surprisingly　　　 B．Not necessarily C．Not importantly　　　 D．Not absolutely

24．---Mr. Parker is so ambitious. He is seeking any opportunity to get promoted.

　 ---That’s understandable.　　　 you are in our company determines how well you are paid and　　　 you can do with your life.

　　　 A．Who; that B．How; what　　　 C．What; that D．Where; what

23．---Hi, Jane. Are you free at six this evening? I was wondering if you could come with me to see the movie “X-men”.

　　 ---I’m sorry but I　　　　 it already. Besides, I　　　　 my mother do the laundry.

　　　 A．had seen; would be helping　　 B．saw; will help

　　　 C．have seen; would help　　 D．have seen; will be helping

22．At the Copenhagen conference, all the countries were called on to do all they could to control greenhouse gas emissions　　　　 it was too late.

　　　 A．when B．after　 C．until　 D．before

第一节：单项填空(共15小题，每小题1分，满分15分)

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

21．Mr. Smith’s decision to attend　　　 ceremony tomorrow can be seen as　　　 gesture of his intention to improve　　　　 the relationship.

　　　 A．the, a, the B．a, a, the　　 C．the, the, a D．a, the, a

4．(20分)如图甲所示，一个质量为m、电荷量q的带正电微粒(重力忽略不计)，从静止开始经电压U₁加速后，沿水平方向进入两等大的水平放置的平行金属板间，金属板长为L，两板间距d＝，两金属板间的电压U₂＝U₁．

⑴求带电微粒偏离原来运动方向的角度θ及此时的速度大小V_t.

⑵微粒离开偏转电场后接着进入一个按图乙规律变化的有界磁场中，磁场左右边线在竖直方向上，已知磁感应强度的大小为B₀，取微粒刚进入磁场时为t＝0时刻，此时磁场方向垂直于纸面向里，当微粒离开磁场的右边缘后恰好在水平线PQ的Q点射出，求该磁场的变化周期T和磁场的宽度S相应的取值．