CR的全称是（）
A.计算机扫描摄影
B.计算机X线摄影
C.计算机体层摄影
D.直接X线摄影
E.计算机横断体层扫描
参考答案：B
用括号内所给词的适当形式填空。
1. The post office isn't far. You can get there (easy).
2. Tom enjoys (skate) very much.
3. The (five) month of a year is May.
4. Bill got up (early) than his sister.
5. Three American (visit) came to our school yesterday.
磷酸氨盐干粉灭火器只能扑救液体和可燃气体的初起火灾。
