搜题请搜索小程序“爱下问搜题”
问题 单项选择题 共用题干题

有研究者欲分析白酒的平均销售量与肝癌的死亡率之间的关系，收集了1998年全国20个大城市白酒的平均销售量与肝癌的死亡率资料。

在应用该方法时易发生的错误是（）。

A.暴露污染

B.匹配过度

C.生态学谬误

D.霍桑效应

E.失访

答案

参考答案：C

填空题

用所给词的适当形式填空。

1. He is __________ (please) with his brother's performance in the school sports meeting.

2. Water __________ (pollute) is really serious because the poison is bad for the river.

3. She __________ (have) her supper with her parents when I got to her home.

4. When he knew the dog died, he left __________ (happy) without a word.

5. We can use knives __________ (cut) meat when we are doing some cooking.

6. He didn't believe their words, so he decided to have a look _________ (he).

7. Please take buses, cars and __________ (taxi) to travel from one place to another.

8. Whom __________ they __________ (study) with this time yesterday?

9. Grandma _________ (have) a bad cold since last Saturday.

10. If we don't protect the wetlands, it will be __________ (possible) to see these birds in the future.

查看答案
多项选择题

原有以规模效应和资金为主的竞争逐步让位于信息利用和灵活协同。互联网为小生产商（品牌商）赋能（）。

A.聚集长尾需求

B.消费者需求实时反馈

C.柔性化生产

D.刚性化管理
查看答案