填入一个适当的词补全对话，每空一词。

A: Hi, Li Yan! Have you ever been 1.             the local library before?

B: You mean the one near the Dragon Tower?

A: That's the one.

B: I go to the English Comer in the library every Saturday. A lot of English lovers practice spoken English

    together. Why 2.              you join us?

A: Sounds great! Could you tell me how to got there?

B: The No. 7 bus will take you right there.

A: How 3.              is it?

B: It's about twenty minutes' ride.

A: 4.              is the nearest bus stop?

B: Walk along the street, and take the first turning on the left. It's opposite the post office. You can't 5.           it.

A: Thanks a lot.

B: You're welcome.

常用于子宫颈癌检测的主要标志是（）

A.鳞状细胞癌抗原

B.CA15－3

C.CA125

D.CA19－9

E.CEA