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问题 选择题

下列说法正确的是 [ ]

A、固定电话的听筒把声音变成变化的电流

B、电磁波不能在真空中传播

C、移动电话是靠电磁波传递信息的

D、用电子邮件可以传输文字、声音文件，但不能传输图像文件

答案

答案：C

填空题
用所给出的词选词填空，每个词只能用一次。
prefer, provide, hand, out, realize, sweet, reminds, cook, came up with, rush, salty, looking for, saving
1. I              classical music to pop music.
2. Could you              me with information about student exchange programs?
3. Be quiet please, class. I'm going to              your test papers.
4. I was waiting for the school bus but it didn't come. Then I             it was Saturday.
5. I don't like eating chocolate. The taste is too             .
6. That man              me of my English teacher. They wear the same clothes.
7. My mother is going to              Beijing Duck tonight. Would you like to come for dinner?
8. My friend Dave              a great idea! We're going to make a pen pal web site.
9. I woke up late this morning. I had to really              to get to school on time.
10. Mom added salt but it still wasn't              enough.
11. We're              a quiet place to go on vacation. Do you know a good place?
12. I'm              my money so I can buy a new bicycle.
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单项选择题

龋均(DMFT)指的是受检人群中平均每人

A．患龋牙数

B．患龋牙面数

C．患龋失补牙数

D．患龋失补牙面数

E．患龋拔补牙面数
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