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问题 单项选择题

对HIV感染患者，可根据其外周血CD4+T淋巴细胞计数和总淋巴数的多少分为三级，第三级的诊断标准是（）

A.CD4+淋巴细胞＞0.5×109/L，总淋巴细胞数＞2.5×109/L

B.CD4+淋巴细胞数＞0.5×109/L，总数＞2.0×109/L

C.CD4+T淋巴细胞数＞（0.2～0.49）×109/L，总淋巴细胞数＞1.0～1.9×109/L

D.CD4+T淋巴细胞数＜0.2×109/L，总淋巴细胞数〈1.0×109/L

E.CD4+淋巴细胞＜0.1×109/L总淋巴细胞数＜1.5×109/L

答案

参考答案：D

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用于汽车减震器上的钢制弹簧片
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                                                           BUS SERVICE

                                           New York City-Brennan, New Jersey

                                               (Trip time: 30 minutes each way)

                                                              Timetable

* Buses leave the Railway Station, New York7:00 a.m. and every half-hour thereafter (此后) until

  11:3p.m. (7 days a week).

* Buses leave Brennan Station 20 minutes before and after every hour from 6:20 a.m. to 10:40 p.m.

  (7 days a week)

* Evening rush hours (5:00 p.m. to 7:00 p.m.) buses leave the Railway Station, New York every 15

  minutes (Monday-Friday).

* Holidays: buses leave every hour on the hour each direction. All tickets must be bought at Window 12,

   the Railway Station, New York, or at the Brennan Station Window before boarding buses.

1. What time does a bus leave New York for Brennan on Thursdays?

A. 6:30 a.m.  

B. 10:20 a.m.

C. 4:40 p.m.

D. 6:45 p.m.

2. Which is the latest bus you should take from Brennan if you have to arrive at the Railway Station, New York before 4:00 p.m. on Monday?

A. The 3:30 p.m. bus.

B. The 3:20 p.m. bus.

C. The 3:40 p.m. bus.

D. The 3:00 p.m. bus.

3. What time does a bus leave Brennan for New York on Christmas Day?

A. 9:40 a.m.

B. 1:00 p.m.

C. 3:15 p.m.

D. 8:30 a.m.  

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