大于多少岁生育者，应在孕中期做胎儿细胞染色体检查以排除染色体异常儿（）。 A.大于3

Little Mary is a good girl. She’s in Grade 2 now. Her home is not far from school, but she is often late for class because she likes watching TV, listening to music in the evening and she goes to bed very late. So she can’t get up on time in the morning.

This term Mr White, Mary’s uncle, works in her school. He teaches Grade 2 history. He often tells Mary to follow the school rules and come to school on time.

Today Mary get up late again. When she comes to school, it is 8:15 . Her uncle is waiting for her at the school gate. “You are ten minutes late for the first class.” Mr White says angrily (生气地). “Why are you often late for class?” “Every time when I get to the street corner（街角）, I always see a sign(标志). It says ‘SCHOOL-GO SLOW!(慢行)’ ” says Mary.

小题1:Mary is a _______year student.

A．fifth

B．second

C．first

D．three小题2:Mary is often late for school. Which reason (原因)is NOT true?

A．She likes watching TV

B．She likes listening to music.

C．Her mother isn’t at home

D．She can’t get up on time in the morning小题3:What does Mr White teach?  He teaches___________.

A．English

B．Chinese

C．math

D．history小题4:The first class begins at _________.

A．8:10

B．8:00

C．8:05

D．8:15小题5:The sign(标志) on the street corner（街角） is for _______.

A．drivers

B．Mary

C．students

D．teachers

某房地产投资项目每年的现金流量如下表所示，若基准收益率为10%，则该项目的净现值为（）万元。

A.8.31

B.87.32

C.137.24

D.205.65

医师和药师根据临床需要和医院用药经验整理选定，再经药事管理委员会和医院领导批准的处方称为

A．固定处方

B．法定处方

C．常用处方

D．协定处方

E．院内处方

对于业主来说，建设工程实施阶段的风险主要是( )。

A．基本风险
B．社会风险
C．投机风险
D．纯风险

mRNA是细胞内种类最多、含量最丰富的RNA。 ( )