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【单选题】
The salesman retired young because______.
A.
he disliked using mobile phones
B.
he was tired of talking on his mobile phone
C.
he couldn't remember simple tasks
D.
his employers doctor persuaded him to
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参考答案：
举一反三
【单选题】对脑卒中的二级预防是指( )
A.
改善脑血管功能并干预危险因素
B.
仅指对脑血管病危险因素的干预
C.
指给与合理的膳食
D.
指对卒中病人的健康教育
查看完整题目与答案
【判断题】干亲又称拟制血亲、准血亲，指的是本无血缘关系，主要是基于收养关系或结拜关系而产生的。但干亲不是亲属关系的组成部分。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】AMERICA'S central bank sent a clear message this week. For the second consecutive meeting, the Federal Open Market Committee, the central bank's policy-making committee, left short term interest rates...
A.
interpret the message from the central bank,
B.
justify the rise of short term interest rates.
C.
illustrate what is weakness and undue growth.
D.
contrast different views on economic indices.
查看完整题目与答案
【单选题】关于造血干细胞移植的表述，正确的是
A.
造血干细胞移植指将从骨髓、外周血或脐带血中分离出的自体或同种异体干细胞注射到骨髓，以使患者重建造血功能
B.
冷冻、融解过程对造血干细胞损伤比较大
C.
造血干细胞移植指静脉输入从骨髓、外周血或脐带血肿分离出的自体或同种异体干细胞，以使患者重建造血功能
D.
造血干细胞不具有分化和自我更新的能力
E.
造血干细胞不具有归巢能力
查看完整题目与答案
【单选题】设y1、y2是二阶常系数线性齐次方程y'+p1y'+p2y=0的两个特解，C1、C2为两个任意常数，则下列命题中正确的是
A.
C1y1+C2y2为该方程的通解
B.
C1y1+C2y2不可能是该方程的通解
C.
C1y1+C2y2为该方程的解
D.
C1y1+C2y2不是该方程的解
查看完整题目与答案
【单选题】设f 1 （x）和f 2 （x）为二阶常系数线性齐次微分方程y″+py′+g=0的两个特解，若由f 1 （x）和f 2 （x）能构成该方程的通解，下列哪个方程是其充分条件（）？
A.
f 1 （x）·f′ 2 （x）-f 2 （x）f′ 1 （x）=0
B.
f 1 （x）·f′ 2 （x）-f 2 （x）·f′ 1 （x）≠0
C.
f 1 （x）f′ 2 （x）+f 2 （x）·f′ 1 （x）=0
D.
f 1 （x）f′ 2 （x）+f 2 （x）f′ 1 （x）≠0
查看完整题目与答案
【单选题】设f1（x）和f2（x）为二阶常系数线性齐次微分方程y″+py′+q=0的两个特解，若由f1（x）和f2（x）能构成该方程的通解，下列哪个方程是其充分条件？（）
A.
f1（x）f′2（x）-f2（x）f′1（x）=0
B.
f1（x）f′2（x）-f2（x）f′1（x）≠0
C.
f1（x）f′2（x）+f2（x）f′1（x）=0
D.
f1（x）f′2（x）+f2（x）f′1（x）≠0
查看完整题目与答案
【单选题】According to the passage, what can we infer to be the central message of Fredric Wertham's The Seduction of the Innocent?
A.
Adults reading violent comic books were as likely to be corrupted by them as young people were.
B.
The horror comic books of the late 1940s were inferior to the superhero comic books that gained popularity during World War Ⅱ.
C.
Comic books were leading the nation's youth into crime, violence, and drug abuse.
D.
Creating a regulatory board to censor the comic book industry would drive the worst offenders out of the business.
E.
Comic books would never be able to convey stories of any serious literary merit.
查看完整题目与答案
【单选题】The word 'message' in the last paragraph means
A.
printed news.
B.
contact.
C.
meaning.
D.
central idea.
查看完整题目与答案
【单选题】How does everyone feel about the message given by America's central bank?
A.
Encouraged.
B.
Panicked.
C.
Confused.
D.
Misguided.
查看完整题目与答案
相关题目：
【单选题】对脑卒中的二级预防是指( )
A.
改善脑血管功能并干预危险因素
B.
仅指对脑血管病危险因素的干预
C.
指给与合理的膳食
D.
指对卒中病人的健康教育
查看完整题目与答案
【判断题】干亲又称拟制血亲、准血亲，指的是本无血缘关系，主要是基于收养关系或结拜关系而产生的。但干亲不是亲属关系的组成部分。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】AMERICA'S central bank sent a clear message this week. For the second consecutive meeting, the Federal Open Market Committee, the central bank's policy-making committee, left short term interest rates...
A.
interpret the message from the central bank,
B.
justify the rise of short term interest rates.
C.
illustrate what is weakness and undue growth.
D.
contrast different views on economic indices.
查看完整题目与答案
【单选题】关于造血干细胞移植的表述，正确的是
A.
造血干细胞移植指将从骨髓、外周血或脐带血中分离出的自体或同种异体干细胞注射到骨髓，以使患者重建造血功能
B.
冷冻、融解过程对造血干细胞损伤比较大
C.
造血干细胞移植指静脉输入从骨髓、外周血或脐带血肿分离出的自体或同种异体干细胞，以使患者重建造血功能
D.
造血干细胞不具有分化和自我更新的能力
E.
造血干细胞不具有归巢能力
查看完整题目与答案
【单选题】设y1、y2是二阶常系数线性齐次方程y'+p1y'+p2y=0的两个特解，C1、C2为两个任意常数，则下列命题中正确的是
A.
C1y1+C2y2为该方程的通解
B.
C1y1+C2y2不可能是该方程的通解
C.
C1y1+C2y2为该方程的解
D.
C1y1+C2y2不是该方程的解
查看完整题目与答案
【单选题】设f 1 （x）和f 2 （x）为二阶常系数线性齐次微分方程y″+py′+g=0的两个特解，若由f 1 （x）和f 2 （x）能构成该方程的通解，下列哪个方程是其充分条件（）？
A.
f 1 （x）·f′ 2 （x）-f 2 （x）f′ 1 （x）=0
B.
f 1 （x）·f′ 2 （x）-f 2 （x）·f′ 1 （x）≠0
C.
f 1 （x）f′ 2 （x）+f 2 （x）·f′ 1 （x）=0
D.
f 1 （x）f′ 2 （x）+f 2 （x）f′ 1 （x）≠0
查看完整题目与答案
【单选题】设f1（x）和f2（x）为二阶常系数线性齐次微分方程y″+py′+q=0的两个特解，若由f1（x）和f2（x）能构成该方程的通解，下列哪个方程是其充分条件？（）
A.
f1（x）f′2（x）-f2（x）f′1（x）=0
B.
f1（x）f′2（x）-f2（x）f′1（x）≠0
C.
f1（x）f′2（x）+f2（x）f′1（x）=0
D.
f1（x）f′2（x）+f2（x）f′1（x）≠0
查看完整题目与答案
【单选题】According to the passage, what can we infer to be the central message of Fredric Wertham's The Seduction of the Innocent?
A.
Adults reading violent comic books were as likely to be corrupted by them as young people were.
B.
The horror comic books of the late 1940s were inferior to the superhero comic books that gained popularity during World War Ⅱ.
C.
Comic books were leading the nation's youth into crime, violence, and drug abuse.
D.
Creating a regulatory board to censor the comic book industry would drive the worst offenders out of the business.
E.
Comic books would never be able to convey stories of any serious literary merit.
查看完整题目与答案
【单选题】The word 'message' in the last paragraph means
A.
printed news.
B.
contact.
C.
meaning.
D.
central idea.
查看完整题目与答案
【单选题】How does everyone feel about the message given by America's central bank?
A.
Encouraged.
B.
Panicked.
C.
Confused.
D.
Misguided.
查看完整题目与答案
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