问题
单项选择题
描述疾病时间分布的特征不包括（）。
A.短期波动
B.季节性
C.间断性
D.周期性
E.长期变异
答案
参考答案：C
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描述疾病时间分布的特征不包括（）。
A.短期波动
B.季节性
C.间断性
D.周期性
E.长期变异
参考答案：C
| 完形填空。 | |||
| We __1__ English, not learning about English. A student can __2__ all about English, but he __3__ not be able to speak English. There is a __4__ between "learning English" and "learning about English". If you __5__ to learn it well, please __6__ the following things. __7__ , learn the expressions (表达) by heart , learn the __8__ sentence, not single words. __9__ don't __10__ about mistakes. It is important __11__ a good habit from the very first lesson. Just try to say __12__ you want to say and don't care __13__ people laugh at you. Keep on __14__ and you'll make __15__ mistakes. | |||
| ( ) 1. A. learning ( ) 2. A. know ( ) 3. A. must ( ) 4. A. different ( ) 5. A. think ( ) 6. A. remember ( ) 7. A. In the end ( ) 8. A. all ( ) 9. A. at any time ( ) 10. A. carry ( ) 11. A. to search ( ) 12. A. where ( ) 13. A. that ( ) 14. A. standing ( ) 15. A. less and less | B. were learning B. tell B. may B differences B. want B. understand B. Most of all B. this B. all the time B. worry B. to repeat B. why B. if B. trying B. more or less | C. are learning C. say C. dare C difference C. try C. read C. First of all C. both C. at the same time C. hurry C. to start C. whom C. how C. putting C. fewer and fewer | D. learn D. sing D. can D. differently D. can D. write D. write D. whole D. at times D. stop D. to develop D. what D. what D. teaching D. write |