病毒属于生物的主要理由是[ ] A.由有机物组成 B.具有细胞结构 C.能使其他

题型:选择题

问题:

病毒属于生物的主要理由是[ ]

A.由有机物组成

B.具有细胞结构

C.能使其他生物致病

D.能复制产生后代

考点:生物体的基本特征
题型:选择题

阅读理解。

    Young people can have problems with their minds. Some student becomes worried because they have to

study very hard. Others have trouble getting on well with people like their parents and classmates.

     Liu Wei, a junior 2 student from Hefei, could not understand his teacher and was doing badly in his lessons.

He became so worried about it that he started to cut his finger with a knife.

     Another student, 14-year-old Yang Fang from Guangzhou, was afraid of exams. She got very worried in

one, and when she looked at the exam paper, she couldn't think of anything to write.

     A recent report from Jiefang Daily says about 18% of Shanghai teenagers have mental problems. Their

troubles include being worried and very unhappy, and having problems in learning and getting on with people.

Many students who gave problems won't go for advice or help. Some think they will look stupid if they go to

see a doctor. Others don't want to talk about their secrets.

     Liang Yuezhu, an expert on teenagers from Beijing Anding Hospital has the following advice for teenagers:

    Talk to your parents or teachers often. 

    Take part in group activities and play sports. 

    Go to see a doctor if you feel unhappy or unwell.

1. The students who often become worried or have trouble getting on with others may have _____. [ ]

A. mental problems

B. a headache

C. knife with them

D. no parents

2. Liu Wei cut his finger with a knife because _____. [ ]

A. he was afraid of his teacher

B. he wanted to frighten his parents

C. he was so worried about his studies

D. his finger was badly hurt

3. Yang Fang's problem happened when _____. [ ]

A. she studied very hard

B. she had exams

C. she talked with her parents

D. she thought of something

4. Students who have problems won't ask others for help because _____. [ ]

A. they won't let others think they are stupid

B. they don't think doctors can help them

C. they think the problems are not serious

D. they have no secrets about others

5. Liang Yuezhu's advice tell us that _____. [ ]

A. it's unnecessary for them to be with others

B. only group activities and sports can help them

C. teachers and parents can't do anything about mental problems

D. it's better for the students who have mental problems to join others.

题型:选择题

抛物线y=x2+3x-4与y轴的交点坐标是______,与x轴的交点坐标是______,______.

题型:选择题

网络管理中的基本模型是______模型。

题型:选择题

何为互补色,哪些颜色互为互补色?

题型:选择题

2014年,中国的进口额在世界中排名是第()名。

A、一

B、二

C、三

D、四

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