氨甲苯酸的作用机制是（）

A.诱导血小板聚积

B.收缩血管

C.促进凝血因子的合成

D.抑制纤溶酶原激活因子

E.以上均不是

T: The summer vacation is coming． Everyone wants to have a good vacation． Can I ask you some questions about your vacation?

S: Sure．

T: 1  do you usually go on vacation?

S: Beijing

T: 2  is the weather there?

S: Sunny

T: How many 3  have you been there?

S: Twice

T: What do you 4  of the people there?

S: Friendly

T: What do you usually do in that place?

S: Go sightseeing

T: OK, Those are all my questions． Thank you．

S: You’re5  ．