在人类发射的数千颗人造卫星中，可以分为___等几种类型。
A.应用卫星
B.科学卫星
C.技术试验卫星
D.侦探卫星
参考答案：A, B, C
单词填空。
1. He is Chinese. He is in C_____ One.
2. I can play football and table tennis, and I can r ____ a bike.
3. Betty is ____ (在…后面)Lingling.
4. How m ____ people are there in your family ?
5. They 've got some ____( 甜瓜).
6. Would you like to go to the ____ ( 电影院 ) with Betty and me?
7. Lessons s ____ in the afternoon at half past one .
8. Tony's sister often buys CDs by her favourte s ____.
9. There are 7,000 a ____ in the zoo.
10. I visit my w ____ at the weekend .
一项病例对照研究，500名病例中有暴露史者400例，而500名对照中有暴露史者100例，其OR值为
A．1.25B．1.6C．16D．160E．无法计算
