如图四幅图片中，属于近视眼成像和矫正的是（ ）
补全对话, 其中有两个多余选项。
A: Hello! This is Tom speaking. ____
B: Sorry, Jack is out at the moment.
A: ____
B: This is Jack’s mother.
A: Hello! Mrs Brown. ____
B: Of course. ____
A: That’s very kind of you. Would you please tell Jack we will have a party about stamp collection this Sunday morning?
B: Oh, a party about stamp collection on Sunday morning. OK, ____
A. Who's speaking, please?
B. Hold the line, please.
C. Can you take a message for me?
D. Can I take a message for you?
E. I'll tell him as soon as he comes back.
F. Could I speak to Joe, please?
G. Could I speak to Jack, please?
有一个风洞实验室，一架模型飞机固定在托盘测力计上如图所示．无风时，托盘测力计示数为15N；当迎面有风吹过时，托盘测力计的示数减小，可以判定飞机受到了一个新的力，我们把这个新的力称为____ 力，方向是____ ．
下面是某小组研究该力的大小与风速关系的实验数据：
风速/（m/s）
5
10
15
20
25
30
35
托盘测力计的示数/N
14．5
13．0
10．5
7．0
2．5
0
根据上面的实验数据可知：飞机受到的这个新的力大小随着风速的增大而____ ．由此推测，飞机短距离快速起飞时应该____ （顺风．逆风）起飞．
当风速达到30m/s以上，托盘测力计的示数是0，说明了什么？____ ．
