问题 单项选择题

男性,30岁。随团去舟山旅游,餐后2h,突然发热、头痛、腹痛、腹泻,伴皮肤潮红,四肢及躯干部荨麻疹,大便7~8次,水样便,有臭味,共餐者有多人发病,食物中毒的可能致病菌是()

A.副溶血弧菌食物中毒

B.普通变形杆菌

C.莫根变形杆菌

D.奇异变形杆菌

E.雷极变形杆菌

答案

参考答案:C

解析:病人在餐后发病,共餐者中有多人患病,符合食物中毒的诊断。患者有两种主要表现,即消化道症状与皮肤过敏表现。此仅见于莫根变形杆菌引起的食物中毒,该菌在食物中繁殖,产生肠毒素引起急性胃肠炎,并能使食物中组胺酸脱羧而形成组胺,引起过敏反应。

阅读理解

阅读理解。

     Have you realized that time has passed very quickly since you entered Grade Nine? Maybe

you think you have so much homework to do every day but you do not have enough time. All

the holidays are far away, so you may feel very upset. However, you needn't be upset.There

are some ways for you to save time and cheer up.

     1. Do less. Please remember: if you want to do everything in one day, you can do nothing

well. So you'd better make a list of things you need to do first, and then decide which things are

the most important, and then put all your energy and time into them.

     2. Don't meet other people too often. Not all meetings will waste your time, but many will.

You should say no to your friends sometimes when they invite you to do outdoor activities. If you

always say yes to those invitations, it may mean that you are giving up your own time and that you

can't do the things you need to do.

     3. Don't make long conversations. You may have one or two close friends in your school

and they may be good at chatting. If you don't want to waste time, you'd better try not to have a

long conversation with them. You should learn how to spend your time.

1. The writer tells us to do _____ first in one day.

A. the most important things

B. the most difficult things

C. as many things as we can

D. something interesting

2. According to the passage, if you want to save time, _____.

A. you need to study with friends

B. you needn't make a list

C. do outdoor activities with your friends

D. you'd better have a short conversation with your close friends

3. _____ ways to save time are talked about in the passage.

A. Two

B. Three

C. Four

D. One

单项选择题