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_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题 A4型题

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。

该研究者运用的研究方法是（）

A.历史资料分析

B.随访研究

C.生态学研究

D.筛查

E.现况研究

答案

参考答案：C

填空题

根据短文意思，用方框中所给词语的适当形式填空。（有两项是多余的）

Address，want，please，speak，practice，really，nobody，friendly，them，but，usually，help

The verb“ chat” means to talk (to someone)in a friendly, informal(非正式的)way. Today there are many 小题1: on the Internet where you can chat. You can chat with people all over the world, in many languages and about many subjects or topics. These places are 小题2: called “chatroom”. Sometimes you need to register( 注册)to enter a chatroom. This means that you need to provide a username(用户名)and possibly your e-mail小题3: .Your username doesn’t have to be your小题4: name.It can be any name you want. When you have your username, other people in the chatroom will call you by that name and 小题5: else can use it.
Chatting is a good way to小题6: your informal English. Messages in a chatroom are usually short sentences. Sometimes小题7: are not even sentences, 小题8: just a few words that are not really grammatically(语法的)correct. It’s a typical way in which we小题9: in a quick conversation with friends. To save time, people often use abbreviations like IDK(I don’t know).So don’t go to a chatroom to practice “perfect” English. Go to a chatroom to practice informal English and find 小题10: .
You can even use a chatroom to help improve your typing skills if you want.

单项选择题案例分析题

下图中的大圆表示晨昏圈，虚线为纬线圈，P点是纬线圈与晨昏圈的切点，Q（0°，90°E）地方时是12时。读图回答下列题。

此时，以下地点位于昼半球的是（）

A．45°N，90°W

B．45°S，160°W

C．90°S，120°E

D．0°，160°E