在社会经济水平高，儿童少年死亡率低的国家，儿童少年的主要死因是（）。 A.传染病 B

现金流贴现模型下股票永远支付固定的股利。（）

用适当的情态动词填空。

1._____ you get on well with your classmates?

2. My daughter was ill.I____take care of her.

3. You'd better go to your hometown,____you?

4. Your shoes are so dirty.____I wash them for you?

5. Aunt Li started early. She____in the city now.

6. The fox____grow grey, but never good.

7. Tim____give up his work because he was badly ill.

用于活细胞的荧光抗体染色，标记抗体的F/P为

A．1.5

B．3.0

C．2.0

D．1.0

E．2.4

我国的台湾海峡属于[ ]

A．东海

B．黄海

C．南海

D．太平洋

在中国国内旅游的团队中，由组团旅行社派出的导游人员叫（）

A.领队

B.全陪

C.地陪

D.景区讲解员

E.中文导游员