对病毒生物学性状的描述,不正确的是A.测量大小的单位为纳米(nm) B.含有DNA和

题型:单项选择题

问题:

对病毒生物学性状的描述,不正确的是

A.测量大小的单位为纳米(nm)

B.含有DNA和RNA两种核酸

C.以复制方式增殖

D.必须寄生于活细胞内

E.属于非细胞型微生物

考点:广西临床住院医师规范化培训医学微生物学医学微生物学题库
题型:单项选择题
已知a,b∈R,且a>b,则下列不等式中成立的是(  )
A.
a
b
>1
B.a2>b2C.lg(a-b)>0D.(
1
2
)a<(
1
2
)b
题型:单项选择题

以下有关枳实的描述不正确的是( )

A.对子宫只表现出显著的兴奋作用

B.既能降低肠管平滑肌张力,又能兴奋胃肠

C.增强心肌收缩力,增加心排血量

D.静脉注射可产生升压作用

E.有镇痛作用

题型:单项选择题

引起新生儿败血症最常见的病原菌是()

A.葡萄球菌和大肠杆菌

B.克雷白杆菌

C.绿脓杆菌和大肠杆菌

D.肺炎球菌

E.溶血性链球菌

题型:单项选择题

氧自由基包括()

A.超氧阴离子自由基

B.过氧化氢

C.羟自由基

D.黄嘌呤氧化酶

E.一氧化氮

题型:单项选择题

A recent online poll (民意调查) asked kids what they hated most about school. “Classes are boring” came in first. “Too much homework” was a close second. Since all activities remain interesting for only so long, too much homework can lead to ennui. So, why are some kids getting homework overload? Teachers give two reasons. First, they say, the government now requires schools to meet higher-than-ever achievement goals for students. If students don’ t succeed, the school faces punishment. Second, many parents want their children to be able to get into the best colleges and universities. These parents believe homework is a way to ensure that students are learning as much as possible.

People who favor homework argue that it can have many beneficial effects. They claim it can help students develop good study habits. Homework can help students recognize that learning can occur at home as well as at school. It can help develop their independent learning and responsible character traits(性格特征).

But studies show that middle school students doing 60 to 90 minutes of homework a night are doing just as well in school as those doing more than 90 minutes. And homework can have negative effects. Homework can deny students access to leisure(休闲) activities that also teach important skills. For example, sports teams teach cooperation and leadership, in addition to helping kids stay physically active. Another problem with too much homework is that parents can get too involved. They can put too much pressure on their kids.

So what should be done? Good homework assignments in the proper amount will have positive effects. Too much homework, however, will have negative effects. The bottom line: Students in grades three through six should do no more than 30 to 60 minutes of homework each night.

小题1:The underline word “ennui” in Paragraph 2 can be replaced by “______” .

A.relaxation

B.fancy

C.boredom

D.intelligence小题2: According to Paragraph 1, the kids are given much homework because ________.

A.schools are evaluated in terms of students’ achievement.

B.the government doesn’t take the problem seriously

C.it is a good way to improve the students’ ability

D.time will be made full use of in this way小题3:Those who are in favor of homework think that _______.

A.homework helps students to succeed

B.it’s good for kids to help each other in learning

C.parents are a great help when kids do homework at home

D.homework helps children to learn independently小题4: Which of the following is NOT a negative effect of too much homework?

A.Kids have little time to do leisure activities.

B.There is a lack of sleeping time.

C.The chances of learning other skills are lost.

D.Kids are under pressure from their parents.小题5: The author’s purpose in writing the passage is _______.

A.to criticize the school teachers

B.to attract public attention to kids’ study

C.to offer more help to today’s kids

D.to call for proper amounts of homework

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