题目内容
20．His aunt always_________ a black dress．（ ）| A． | put on | B． | puts on | C． | wear | D． | wears |
分析 他的叔叔总是穿着一件黑色的衣服．
解答 答案：D put on意为．穿上，指穿的动作； wear表示穿的状态；句意：他的叔叔总是穿着一件黑色的衣服．表示穿的状态，故用wear，同时句中的always可知是习惯，故时态是一般现在时，主语是第三人称单数，后面的动词要用第三人称单数形式，故选D．
点评 解答此类问题首先要理解每个单词的基本含义，并注意交叉含义间的区别，了解其特殊用法及习惯搭配等特点，然后结合语境选择正确答案．
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However，life on Mars may not be better than that on the Earth today．Food will not be the same meals will probably be in the form of pills and will not be as delicious as they are today．（80）B，space travel will make many people feel ill．The spaceship will travel fast but the journey to mars will probably be very uncomfortable．
Firstly，（76）D should be much better．Spaceships can travel at half the speed of light．It might take us two or three days to get to Mars．
Secondly，humans need food，water and air to live．Scientists should be able to develop plants that can be grown on Mars．These plants will （77）B the food and the air that we need．
There is a problem for us to live on Mars．Mars makes us much lighter than the Earth does．This will be dangerous because we could easily jump too high and fly slowly away into space．To prevent this，humans on Mars have to wear special shoes to make themselves（78）D
Life on mars will be better than that on the Earth （79）C．People will have more space．Living in a large building with 10bedrooms is highly possible．Many people believe that robots will do most of our work．
However，life on Mars may not be better than that on the Earth today．Food will not be the same meals will probably be in the form of pills and will not be as delicious as they are today．（80）B，space travel will make many people feel ill．The spaceship will travel fast but the journey to mars will probably be very uncomfortable．
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