问题 选择题

下列命题中,正确的是(  )

A.两个任意的正方形相似

B.两个任意的直角三角形相似

C.两个任意的矩形相似

D.两个任意的菱形相似

答案

A、两个正方形的对应边都相等成比例,对应角都是直角,相等,所以一定相似,故本选项正确;

B、两个直角三角形的对应边不一定成比例,对应角除了直角,其它两对对应角不一定相等,所以一定相似,故本选项错误;

C、两个矩形的对应边不一定成比例,对应角都是直角,相等,所以不一定相似,故本选项错误;

D、两个菱形的对应边都相等成比例,对应角不一定相等,所以不一定相似,故本选项错误.

故选A.

阅读理解

根据短文内容,选择正确答案.

Anger is a kind of feeling. Many things can make you angry. When your teacher gives you too much homework, when your team loses an important game, when a friend borrows your favorite thing and then breaks it, you can get really angry. Usually, your body tells you when you are angry. For example, you breathe(呼吸) faster, your face turns red, and you may want to break something or hit(打) someone, but sometimes, you hide(隐藏) your anger. For example, you may hide it in your heart. The problem is that if you do this, you may get a headache or your stomach may hurt. In fact, it’s not good to hide your anger, and it’s important for you to get angry sometimes. But anger must be let out in the right way, without hurting others or yourself. When you get angry, you can talk about it with other people It’s helpful to talk about your anger with an adult(成年人,大人), such as a parent, a teacher, etc. When you talk about anger, those bad feelings can start to go away. Here are some other things you can do when you start to feel angry: talk to a good friend; count from 1 to 100; give someone a hug(拥抱); go for a bike ride; think about good things, etc. Remember that how you act when you are angry can make everything better or worse. Don’t let your anger control you.

小题1:You may not get angry when __________.

A. there is too much homework on this weekend

B. your favorite basketball team wins the game

C. a friend breaks your favorite thing

小题2:________ shows that you are not angry.

A. Taking a faster breath

B. Getting a headache

C. Wanting to protect someone

小题3:According to the passage, you can do everything when you get angry except(除了) __________.

A. go for a bike ride

B. think about good things

C. say bad things to the people around you

小题4:The underlined(画线的) word “control” in the last paragraph(段)means _______ in Chinese.

A.控制

B.连接

C.帮助

D.失去小题5:This passage is mainly(主要) about _________.

A. anger    B. excitement    C. happiness

多项选择题