问题
单项选择题 B1型题
流脑隐性感染后免疫能力达高峰的年龄是（）
A.1～5个月
B.6个月～5岁
C.15～18岁
D.20岁
E.50岁以上
答案
参考答案：E
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流脑隐性感染后免疫能力达高峰的年龄是（）
A.1～5个月
B.6个月～5岁
C.15～18岁
D.20岁
E.50岁以上
参考答案：E
| 完形填空 | |||
| English people often go out with an umbrella or a raincoat. Why? 1 the weather in Britain often changes quickly. Spring can be rainy or windy, 2 the weather is getting warmer and you can hope more sunny days. In fact, there 3 as much sunshine in spring as in summer. Summer is 4 time for visitors to go to the seaside. People often go out to have a walk or swim. Autumn is a beautiful season. During autumn it is still nice to be outside, too. In winter, it gets colder, and it might 5 ,especially in the north. There are 6 very heavy winds in this season. February is usually the coldest 7 of the year, while the warmest 8 often July. The difference 9 temperature between winter and summer is not so great in Britain. The average temperature for winter is about 4.5℃, and for 10 is about 15.5℃. | |||
| ( )1. A. Because ( )2. A. so ( )3. A. have ( )4. A. the worst ( )5. A. rain ( )6. A. too ( )7. A. weather ( )8. A. is ( )9. A. in ( )10. A. spring | B. As B. but B. can have B. the best B. wind B. either B. season B. was B. on B. summer | C. For C. or C. can be C. the latest C. hot C. also C. month C. are C. by C. autumn | D. Since D. for D. can D. the earliest D. snow D. as well D. day D. were D. for D. winter |