可引起支气管哮喘发作的条件有：（） A.使腺苷酸环化酶活性增高 B.使磷酸二酯酶活性

根据句意，用括号内所给单词的适当形式填空。

1. I like P.E. best. Because my P.E. teacher is very ________ (friend) to us.

2. — Where is your bedroom? — It's on the                (two) floor.

3. — Thank you for your help. — It's my ________ (please).

4. All the books are on these ________ (shelf). You may go to find it.

5. Kangkang likes ________ (dance) at the party, because it's interesting.

在油-水混合物中，加入的乳化剂分子亲水一端的横向大于亲油一端的横截面，则形成( )型乳状液。

A．(W/O

B．(O/W

C．(无法确定

D．(无特定类

证券交易所规定的交易原则是（）。

A．时间优先

B．投资者优先

C．效率优先

D．价格优先

体内再生分为哪几种？

因履行（）运力国防动员义务而遭受直接财产损失、人员伤亡的，依法享有获得补偿、抚恤的权利.

A.备用

B.警用

C.军用

D.民用