阅读理解。

1. The zoo opens _____ a week.

A. two days

B. five days

C. six days

D. seven days

2. On Tuesday, the zoo closes at _____.

A. 5: 30 p.m.

B. 6:00 p.m.

C. 6:30 a.m.

D. 8: 30 a.m.

3. On Wednesday, the zoo is open for _____.

A. 8 hours

B. 8.5 hours

C. 9 hours

D. 9.5 hours

4. The zoo is in the city called _____.

A. Xiaohe

B. Binhai

C. Changchun

D. Beibei

5. Beibei is 11 years old,and this Sunday she wants to visit the zoo with her parents. How much

    should they pay for the tickets?

A.￥20.

B.￥30.

C.￥40.

D.￥50.

临床及文献中常说的Rh阳性是指C抗原阳性。（）