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问题 单项选择题 A1型题

当牛发生中毒后，表现为急性肺水肿、严重呼吸困难及皮下气肿，此病是（）

A.亚硝酸盐中毒

B.尿素中毒

C.杂色曲霉毒素中毒

D.黑斑病甘薯毒素中毒

E.蕨中毒

答案

参考答案：D

阅读理解

Problems
Causes
Advice
 
Feel stressed
Too much homework. Don’t have enough time for their hobbies.
Make a plan for study and hobbies. Find time to relax.
 
Get short-sighted
Too much homework. Bad study habits.
Do eye exercises or read in a correct way.
 
Fight with each other
Don’t know how to get on well with classmates.
Make more friends and understand each other.
 
Don’t like to study
The bad influence of computer games.
Play computer games just for a short time.
 
Get fat
Have more pocket money to buy snacks. Don’t like to do exercise.
Use your pocket money to do something meaningful. Do exercise every day.
 
小题1:For whom is this form above most probably written?
A．Parents.B．Children.C．Teachers.D．Students.
小题2:According to the information given in the form, why don’t students like to study?
A．Because of too much homework.
B．Because they don’t know how to get on well with classmates.
C．Because of the influence of computer games.
D．Because they don’t like to do exercise.
小题3:_______ will help you avoid becoming short-sighted.
A．Doing eye exercises regularlyB．Reading in bed
C．Reading in the sun D．Reading too long
小题4:If you feel stressed, you should ________.
A．do less homework
B．make plans for your study, hobbies and relaxation
C．fight with others
D．have some snacks
小题5:Peter is very fat. Maybe he ________.
A．plays computer games too muchB．has too many snacks
C．doesn’t like to do exerciseD．B＆C
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问答题 简答题

类的加载采用父亲委托机制，它有什么优点？
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