Directions: Complete the following passage by using ONE word that best fits the context (8 points).

Dear Professor Liu Kai,

I want to thank you for offering me such useful advice during my research. I have completed my article about advertisements, and I’m quite satisfied   58    it. It has just been published on our school website. I never knew that advertisements were so interesting! The information I found will really help me to educate others. I hope that after they    59    my article, my schoolmates will understand that PSAs    60   intended to educate us about public welfare issues, and    61    commercial ads are meant to promote products or services. Before our talk, I did not think very much about how an advertiser might be trying to trick customers    62   buying a   63   or a service. Now I think I will be much smarter about what things to buy. Even if there are lots of exciting images and persuasive language. I will remember to think about the things I buy. I will also pay a    64    more attention to the nationwide public service ad campaigns because now I know how helpful they can be. I will encourage my friends    65    pay attention to them as well.

Thank you again for helping me find so much useful information!

Yours faithfully

Qian Lili

表达式(7\2+1)*(8\2+2)的值为（ ）。

A．在活动窗体中只能通过拖拉右上角和左下角的小方块来同时在高度和宽度上缩放 控件

B．若一个控件上有4个黑色的小方块，表明该控件是活动的

C．窗体中活动控件只能有一个

D．非活动控件在窗体是隐藏的