问题
单项选择题
据研究滑翔事故一篇报道；有73％滑翔事故发生在上牛11：00至下午3：00这段时间内。因此建议禁止在这段时间进行滑翔运动，这样做：（）。
A.对
B.不对，因为未用率来进行比较
C.不对，因为用患病率代替了发病率
D.不对，因为未设对照组
答案
参考答案：B
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据研究滑翔事故一篇报道；有73％滑翔事故发生在上牛11：00至下午3：00这段时间内。因此建议禁止在这段时间进行滑翔运动，这样做：（）。
A.对
B.不对，因为未用率来进行比较
C.不对，因为用患病率代替了发病率
D.不对，因为未设对照组
参考答案：B
| 完形填空。 | |||
| Some of my classmates are not feeling __1__ today. Tom has a __2__ , he can't eat __3__ Jack has a headache. His mother asks him __4__ and rest. __5__ he can't come to school today. Peter is stressed out, __6__ the exam is coming. Nancy has a __7__ because she ate too much yesterday. She doesn't feel like __8__ anything. Jim has a sore throat, he should drink hot tea __9__ honey. Lucy has a toothache, too. She has to see __10__ after school. | |||
| ( ) 1. A. good ( ) 2. A. headache ( ) 3. A. something ( ) 4. A. lie down ( ) 5. A. So ( ) 6. A. because ( ) 7. A. headache ( ) 8. A. eat ( ) 9. A. and ( ) 10. A. her parents | B. well B. stomachache B. anything B. lies down B. But B. until B. toothache B. eats B. with B. her friends | C. health C. toothache C. everything C. lying down C. Or C. though C. stomachache C. eating C. or C. her teacher | D. ill D. sore back D. nothing D. to lie down D. because D. when D. sore throat D. to eat D. in D. dentist |