问题 选择题

草履虫能完成许多生理活动。下列关于其结构和生理功能的对应关系不正确的是(   )   

A.表膜——呼吸和排泄

B.食物泡——消化食物

C.伸缩泡——伸缩产生运动的动力

D.胞肛——排出食物残渣

答案

答案:C

题目分析:草履虫的身体外层是表膜,表膜具有呼吸和排泄的功能;草履虫的身体内部有多个食物泡,食物泡在细胞质中流动,起消化食物的作用;不能消化的食物残渣由胞肛排出体外;草履虫身体的前端和后端各有一个伸缩泡,具有调节水和盐的代谢平衡的作用。故选项C符合题意。

选择题
阅读理解

Since the first Earth Day in 1970,American have gotten a lot “greenter” toward the environment . “We didn’t know at that time there even was an environment,let alone that there was a problem with it,”says Bruce Anderson,president of Earth Day USA.

But what began as nothing important in public affairs has grown into a social movement .Business people,political leaders, university professors,and especially millions of grass-roots Americans are taking part in the movement. “The understanding has increased many ,many times,”says Gaylord Nelson,the fromer govermor from Wisconsin,who thought up the first According to US government reports , emissions (排放)from cars and trucks have dropped from 10.3 million tons a year to 5.5 tons .The number of cities producing CO beyond the standard has been reduced from 40 to 9 .Although serious problems still remain and need to be dealt with , the world is a safer and healthier place .A kind of “Green thinking ” has become part of practices .

Great improvement has been achieved .In 1988 there were only 600 recycling programs ,; today in 1995 there are about 6,600 .Advanced lights ,motors , and building designs have helped save a lot of energy and therefore prevented pollution .

Twenty –five years ago , there were hardly any education programs for environment .Today , it’s hard to find a public school , university , or law school that does not have such a kind of program .” Until we do that , nothing else will change! ” say Bruce Anderson .

小题1:According to Anderson , before 1970, Americans had little idea about ___

A.the social movement

B.recycling techniques

C.environmental problems

D.the importance of Earth Day小题2:Where does the support for environmental protection mainly come from?

A.The grass –roots level

B.The business circle

C.Government officials

D.University professors小题3:What have Americans achieved in environmental protection ?

A.They have cut car emissions to the lowest

B.They have settled their environmental problems

C.They have lowered their CO levels in forty cities.

D.They have reduced pollution through effective measures .小题4:What is especially important for environmental protection according to the last paragraph ?

A.Education

B.Planning

C.Green living

D.CO reduction