驼奶是如何生产保存的？

阅读短文，用动词的适当形式填空。

        1   ( look) at the picture. It's a picture of a classroom. What can you   2   (see) in the classroom? I

can see a big desk in the front of the classroom Some books   3   (be) on the desk. What other things

can you see on the teacher's desk?  I can see two white books. There   4   (be) some chalk in them.

Where   5   (be) the brooms? They are behind the door.

以下属于我国预防未成年人犯罪法规定的严重不良行为的是( )。

A．传播淫秽读物

B．旷课、夜不归宿

C．沉迷网络

D．给异性同学写情书

如图，质量为m、带电量为+q的三个相同的带电小球A、B、C，从同一高度以初速度v₀水平抛出，B球处于竖直向下的匀强磁场中，C球处于垂直纸面向里的匀强电场中，它们落地的时间分别为t_A、t_B、t_C，落地时的速度大小分别为v_A、v_B、v_C，则以下判断正确的是：（　　）

A．t_A=t_B=t_C

B．t_A=t_B＞t_C

C．v_B＞v_A=v_C

D．v_A=v_B＜v_C

如图所示，空间存在足够大、正交的匀强电、磁场，电场强度为E、方向竖直向下，磁感应强度为B、方向垂直纸面向里。从电、磁场中某点P由静止释放一个质量为m、带电量为+q的粒子（粒子受到的重力忽略不计），其运动轨迹如图虚线所示。对于带电粒子在电、磁场中下落的最大高度H，下面给出了四个表达式，用你已有的知识计算可能会有困难，但你可以用学过的知识对下面的四个选项做出判断。你认为正确的是（ ） 

A.        B. C.        D.  

完成句子

1. The performance of the host, ________________( 旨在)to please the audience and draw

    their attention, was greeted with a cold silence, however.(intend)

2. I'm afraid I won't be able to attend the meeting at 3 ∶00 p. m. next Monday. I ___________( 已

   经坐飞机到) New York long before then.(fly)

3. Come to my office tomorrow if ________________( 你方便的话). (convenient)

4. You'd better call him up ________________( 万一他记不清)the exact time.(remember)

5. The food must be eaten up within three days ________________( 一旦打开). (open)

6. A major problem arose at the meeting ________________( 要花多少钱) to complete the whole

   project.(cost)

7. He wished to forget everything ________________( 与原来生活有联系的)and start a new life.

   (associate)

8. In no case ________________( 允许他)to get up until he was completely recovered from his

    illness.(allow)

9. She is busy with applying for a patent recently, and has ________________( 没时间整理房间)

    which is in a mess now.(tidy)

10. Color blind people often find ________________( 难以区分)between blue and green.(distinguish)