问题 单项选择题

下列哪一项不属于“多种有害物质的联合作用”的方式

A.独立作用

B.相加作用

C.作用时间

D.拮抗作用

E.协同作用

答案

参考答案:C

解析:[解题思路] 环境污染物常常不是单一的,而是经常与其它化学、物理因素同时作用于人体,其主要有下列几种类型:相加作用、协同作用、拮抗作用、独立作用。

阅读理解

阅读理解。

     The two largest islands of the British Isles(不列颠群岛)are Great Britain and Ireland. There are

three regions(地区)in Great Britain. They are England, Scotland and Wales. Scotland lies to the north of England, and Wales to the southwest. Ireland lies to the west of Great Britain. It is a smaller island than Great Britain.

     The Atlantic Ocean lies between the British Isles and America, and the Irish Sea between Great Britain and Ireland. The North Sea is on the east side of Great Britain. To the south is the English Channel. Every day large ships cross the Atalntic Ocean to America and saller ones cross the North Sea and the Channel

to Europe.

l. Which of the following maps gives the correct relationship between Great Britain, the British Isles and

Scotland?

A. G-Great Britain;

B. B-British Isles;

C. S-Scotland

2. According to the passage, which of the following statements is correct?

A. Ireland is the smallest island of the British Isles.

B. Great Britain is larger than the British Isles.

C. England, Scotland, Wales and Ireland belong to one country in Europe.

D. Great Britain is the largest island of the British Isles.

3. The following is the map of the three regions in Great Britain, which one is correct?

A. S-Scotland;

B. E-England;

C. W-Wales

4. Great Britain is separated from Ireland by ______.

A. the Atlantic Ocean  

B. the Pacific Ocean

C. the Irish Sea  

D. the English Channel

5. ______ lies to the south of Ereat Britain.

A. the North Sea  

B. the English Channel

C. the Atlantic Ocean  

D. the Irish Sea

单项选择题