边际资本成本是指当公司无法以某一固定的资本成本筹集无限的资金，公司筹集的资金超过一定

Jack Black has a big ___1___. His grandfather and grandmother ___2___ in England. They are at home. Their ___3___ are Nick Black and Anna Black. But Jack’s parents are in China. Jack’s ___4___ is an English teacher. He works in a middle school. Jack’s mother ___5___ a teacher. She is a doctor (医生). Jack and his ___6___ Mary are students. They go to the same (同一个) ___7___ in Beijing. Jack is ___8___ Class One, Grade Seven. At school Jack has ___9___ good friends. They are Lin Feng, Li Lei, and Sun Weiming. Mary has many good friends, too. They ___10___ their school.

1. A. bag        B. room        C. family        D. school

2. A. is          B. are         C. be            D. am

3. A. names      B. numbers     C. address        D. ID cards

4. A. sister       B. mother      C. brother        D. father

5. A. is          B. isn’t        C. don’t          D. are

6. A. sister       B. brother.      C. friend         D. uncle

7. A. class       B. grade        C. school         D. classroom

8. A. at          B. in.          C. on            D. under

9. A. two        B. three        C. four          D. five

10.A. have       B. like         C. meet          D. look

下列( )不是金融期货。

A．黄金期货

B．外汇期货

C．利率期货

D．股指期货

下列现象中属于应用大气压强的是（　　）

A．用力捏矿泉水瓶，瓶变瘪了

B．篮球撞击在篮板上被弹回

C．把药液射进肌肉里

D．茶壶盖上留有小孔

双吸式离心泵特性曲线的形状与单吸式离心泵不同。