心肌梗死特征性心电图出现在I、aVL、V5(V6)导联，可以确定梗死的部位是　A．前

阅读理解.

     Before you go to another country, it is a great help if you know the language and some of the customs

of the country.

     When people meet each other for the first time in Britain, they say "Hello!" or "Nice to meet you,"

and shake hands. Usually they do not shake hands when they just meet or say goodbye. But they shake

hands after they haven't met for a long time or when they will be away from each other for a long time.

     Last year a group of German students went to England for a holiday. Their teacher told them that the

English people hardly shake hands. So when they met their English friends at the station, they kept their

hands behind their backs. The English students had learned that the Germans shake hands as often as

possible, so they put their hands in front and got ready to shake hands with them. It made both of them

laugh.

1. If you want to travel, it is _____ for you to know the language and some of the customs of the country

   you are going to visit.

A. not useful      

B. not helpful    

C. very helpful  

D. very had

2. English people usually shake hands when they ______.

A. meet every time                  

B. meet for the first time

C. say goodbye to each other            

D. say hello to each other

3. Usually English people don’t shake hands _____.

A. when they will he away for a long time

B. when they say “How do you do?”

C. when they just meet or say goodbye  

D. after they haven’t met for a long time

4. According to the passage, which of the following is TRUE?

A. The Germans shake hands as often as possible.

B. The English people like shaking hands very much.

C. The Germans hardly shake hands.

D. Neither the English people nor the Germans like shaking hands.

5. This story is about ______.

A. shaking hands

B. languages    

C. customs

D. languages and customs

在磁场中的同一位置，先后引入长度相等的直导线a和b，a、b导线的方向均与磁场方向垂直，但两导线中的电流不同，因此所受到的力也不相同．下图中的几幅图象表现的是导线所受到的力F与通过导线的电流I的关系．a、b各自有一组F、I的数据，在图象中各描出一个点．下列四幅图中正确的是  (      )

斗式提升机按牵引构件的形式可分为哪几种？

以下对有关盗毒蛾说法正确的是（）

A.没有趋光性

B.以幼虫越冬

C.有趋光性

D.雌蛾寿命较雄蛾长

过量饮酒或酗酒，还会增加发生（）的风险。

A.高血压

B.脑中风

C.交通事故

D.暴力事件