证人李某为公安机关作证，其有权要求公安机关保障其子女和兄妹的人身安全。（）

We are learning English, but how can we learn English well? A student can know a lot about English, but maybe he can not speak English.

If you want to know how to swim, you must get into the river. And if you want to be a football player, you must play football. So , you see, you can learn English only by using it. You listen to your teacher carefully in class. You must read your lessons every day. You must speak English to your English teacher and classmates and also you must write in English. Then one day, you may find your English very good.

小题1:You know a lot about English but maybe you ______.

A．can’t speak it

B．can study it

C．can’t study it

D．can’t use it小题2:You must get into the river ______.

A．to play with water

B．to go boating

C．to learn how to swim

D．to catch a fish小题3:Do you want to be a football player? Please____.

A．put your football away

B．buy a good football

C．play football

D．watch others play football小题4:According to the passage，how can we learn English well ?

A．We must have a good English book.

B．We must have a good English teacher.

C．We must see more English films.

D．We must use it often.小题5: Who can you speak English to in your class?

A．Only my classmates.

B．My English teacher and classmates.

C．My father and mother.

D．All my friends.

有A，B，C三人，他们分别是工人、教师、工程师．A的年龄比工人大，C和教师的年龄不同岁，教师的年龄比B小，那么工程师是______．

预防感染需积极治疗的是（）

A.贫血、低蛋白血症

B.糖尿病、尿毒症

C.清创术

D.及时采取特异性免疫疗法

E.切断病原菌传播环节

按操作控制机制的不同，可以将操作技能分为( )。

A．细微型操作技能和粗放型操作技能

B．连续性操作技能和断续性操作技能

C．闭合性操作技能和开放性操作技能

D．徒手性操作技能和器械性操作技能

在宿主抗移植物排斥反应中，下列哪种反应最严重（）

A.急性排斥反应

B.超急性排斥反应

C.慢性排斥反应

D.亚急性排斥反应

E.迟发排斥反应