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【单选题】
关于特异性免疫,下列说法错误的是A.
是维持个体健康的重要功能之一
B.
是人体在长期生活过程中与病原微生物等抗原物质接触后所产生的免疫
C.
在机体出生后形成的
D.
可遗传
E.
具有特异性
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反馈参考答案：
举一反三
【单选题】The mother said she would ______ her son washing the dishes if he could finish his assignment before supper.
A.
let down
B.
let alone
C.
let off
D.
let out
【单选题】She is going to France on a special ______ for one of the major daily newspapers.
A.
assignment
B.
mission
C.
tour
D.
role
【单选题】听力原文：W: Why don't you go to bed, Ted? You look so bad. M: I have to finish this assignment which has to be handed in tomorrow morning. Q: Why is Ted up late? (13)
A.
His mother wants him to do his homework.
B.
He has to finish his homework.
C.
He is too excited to sleep.
D.
He doesn't know it is very late.
【单选题】What are the reasonable excuses for extensions?
A.
Planning problems.
B.
Problems with assignment deadlines.
C.
Personal illness or accident.
D.
Frequent absences from class.
【简答题】查询信息系年龄超过18岁王姓学生的学号,姓名,年龄
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