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问题 选择题

人类对感冒病毒好像很无奈，感冒刚好有可能再次感冒，主要原因是[ ]

A．人体中没有抵抗感冒病毒的物质

B．人体效应T细胞失去应有功能

C．人体免疫系统遭到病毒的破坏

D．感冒病毒的变异性大

答案

答案：D

单项选择题 A1型题

对霍乱患者应隔离治疗，至症状消失6天后，并隔日粪便培养1次，连续几次致病菌阴性者可解除隔离（）

A.1次

B.2次

C.3次

D.4次

E.5次
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单项选择题

Passage oneLong bus rides are like television shows .They have a beginning ,a Middle and an end –with commercials thrown in every three or four minutes .The commercials are unavoidable .They happen whether you want them or not .Every couple of minutes a billboard glides by outside the bus window . “buy super clean toothpaste”. “Drink Good’n Wet Root Beer .””Fill up with Pacific Gas .”Only if you sleep ,which site equal to turning the television set off ,are you spared the unending cry of “You Need It ! Buy It Now !” The beginning of the ride is comfortable and somewhat exciting ,Even if you’ve traveled that way before .usually some things have changed-new houses ,new buildings ,sometimes even a new road .The bus driver has a style of driving and it’s fun to try to figure it out the first hour or so . If the driver is particularly reckless or daring ,the ride can be an thrilling as a suspense story .Will the driver pass the truck in time Will the driver move into the right or the left –hand lane After a while,of course,the excitement dies down .sleeping for a while helps pass the middle hours of the ride .Food always makes bus rides more interesting .But you’ve got to be careful of what kind of foodyou eat .Too much salty food can make you very thirsty between stops. The end of the ride is somewhat like the beginning .You know it will soon be over and there’s a kind of expectation and excitement in that .The seat ,of course ,has become harder as the hours have passed.By now you’ve sat with you legs crossed ,with your hands crossed behind your head .the end comes just at the right time . There are just no more ways to sit.

According to the passage ,what do the passengers usually see when they are on a longBus trip( )

A．Buses on the road

B． Films on television

C．Advertisements on the board

D． gas stations

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