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问题 多选题

在升降机中的人，发现自己站的测力计示数比自己的体重要小，则（　　）

A．升降机可能正在加速上升

B．升降机可能正在加速下降

C．人受到的重力减小了

D．人受到的重力不变

答案

A、由题可知，升降机处于失重状态，具有向下的加速度，可能减速上升．故A错误．

B、由题可知，升降机处于失重状态，具有向下的加速度，可能加速下降．故B正确．

C、D人的重力由自身的质量和重力加速度决定，与升降机的状态无关，则人受到的重力不变．故C错误，D正确．

故选BD

阅读理解

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Date: April 8----April 22
Time: 7:30 a.m. -------5:00 p.m.
Price: $ 80
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Time: 9:00 a.m.---8:00 p.m.
Price: $60
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Something about Shenzhou VII
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Time:8:30a.m.---5:30 p.m.(Weekends)
9:00a.m.--- 5:00 p.m.
(Monday—Friday)
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根据短文内容，选择正确答案。
小题1:If you want to enjoy jazz, you should call _________.
A．88564822B．88656662C．88655468D．88656886
小题2:Hebei Museum opens _______ hours a week.
A．18B．40C．58D．68
小题3:If Jack wants to be an excellent dancer when he grows up, he should go to ___.
A．Rainbow Jazz ClubB．Blue Sky Theater
C．Hebei MuseumD．Hong Kong
小题4:What can visitors do in Hong Kong according to the material?
A．They can enjoy real American jazz and the pleasure of the ferry.
B．They can see something about Shenzhou VII and enjoy real American jazz.
C．They can enjoy the pleasure of the ferry and see the fantastic city nights.
D．They can enjoy waltz in Hong Kong.
小题5:Which of the following is TRUE according to the material?
A．You need to spend $60 learning waltz.
B．You can enjoy American jazz at Rainbow Jazz Club in the morning.
C．You can go to Heibei Museum to look at the show every day except weekends.
D．You can watch good movies in Hong Kong.
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单项选择题

下列哪项为乙型肝炎病毒核心抗原（）

A.HBcAg

B.HBeAg

C.HCV

D.HEV

E.HBsAg
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