问题
单项选择题
导致X线衰减的原因是（）
A.物质和距离
B.X线不可见
C.X线波长短
D.X线能量大
E.X线是电磁波
答案
参考答案：A
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导致X线衰减的原因是（）
A.物质和距离
B.X线不可见
C.X线波长短
D.X线能量大
E.X线是电磁波
参考答案：A
补全对话（每小题1分，满分5分） A：Hi，Cindy. Your handbag looks so nice. ____小题1:___. B: Online. It’s only 30 yuan. A：30 yuan online? _____小题2:___. Tell me how to do it ,please. B: All right. That’s easy. Just enter E-buy. A：____小题3:___. B: Well, first, you need to apply for(申请)a user’s passport. Next, go through the shopping list. A：And then? B: Choose one you like. _____小题4:____. You’ll receive it in a few days. A：Thank you. ____小题5:___.
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