下列关于性状的说法正确的是( ) A.生物的性状只由基因决定 B.生物具有相对性

题型:选择题

问题:

下列关于性状的说法正确的是(  )

A.生物的性状只由基因决定

B.生物具有相对性状是变异的结果

C.生物的性状一旦形成,就不会改变

D.环境也影响生物的性状,并且能遗传下去

考点:基因控制生物的性状变异
题型:选择题

阅读理解。

     What would you be like if the entrance exam to senior high school was tomorrow? Peaceful and happy

as usual? Or, would you become worried and uneasy?

     "I was surprised at how I could get angry so easily with my parents before a big exam," said Junior 3

student Wang Yangqian from Hefei. "I couldn't fall asleep even after I'd been in bed for two hours."

    Not only exams but also other things, like a big game, can make you different from how you are usually.

    You may act differently because you are stressed out. Stress is what you feel when you are worried or

uncomfortable about something. Usually your hands get wet and your heart beats faster. You feel stressed

because you might ask too much of yourself sometimes. Or, your parents, teachers or classmates put too

much pressure on you. This can make you worried. But being stressed is not always a big problem. Everybody,

even sports stars, can get a little worried before a big game.

     Some kinds of stress are good. Good stress might show up when you're called on in class or when you

have to give a report. This kind of stress can help you get things done well. You may do a better job in your

book report if the anxiety pushes you to do more work before you read it to the class.

     Sometimes stress can turn into something bad if you keep having stressful feelings for a long time. This

kind of stress isn't going to help you. It can make you sick. You may have trouble paying attention at school

and forget things easily.

     So, remember to stay relaxed. It won't be the end of the world, even if you don't pass the exam.

1. The main idea of this passage is _________.

A. stress only makes people worried

B. stress can push you to work harder

C. stress can be good or bad for people

D. stress always causes problems

2. According to the passage, what will happen if people are stressed?

A. They will sleep very well.

B. Their hearts will beat faster.

C. Their hands will become dirty.

D. They will find lots of problems.

3. The underlined part "anxiety" in the passage probably means "_________".

A. 生气

B. 饥饿

C. 力量

D. 焦虑

4. According to the passage, you may feel stressed except when you _________.

A. are worried or uncomfortable about something

B. ask too much of yourself

C. have too much pressure

D. pass an exam easily

5. A healthy way to get rid of stress may be _________.

A. working hard all day

B. smoking

C. listening to some light music

D. sleeping and trying to forget everything

题型:选择题

下列物质中属于离子化合物的是( )。

A.苛性钠

B.碘化氢

C.硫酸

D.醋酸

题型:选择题

普米克的三种剂型分别是()。

A.片剂、水针剂、气雾剂

B.粉针剂、气雾剂、片剂

C.气雾剂、粉吸入剂、吸入用悬混液

D.针剂、粉吸入剂、气雾剂

题型:选择题

甲硝唑对肠内、肠外阿米巴滋养均有强大的杀灭作用。

题型:选择题

所有者权益与负债都是企业资产的来源。( )

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