题干

如果互相垂直,则实数等于( )

A:

B:

C:或

D:或-2

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答案(点此获取答案解析)

D

同类题1

阅读下面短文,从短文后各题所给的四个选项(A、B、C、D)中,选出可以填入空白处的最佳选项。

    Smiling is the most desirable human behavior. We tend to overlook the power of smiling, 1 can work out many wonders and miracles.

    In my spare time in the State, I loved to take a walk around the small community where I lived.  2 I met on the way, they always gave me a friendly greeting accompanied with a nice smile as soon as our eyes had 3 . Spontaneously(本能地), I smiled back. This kind of smiling exchange represented the most  4 part of my jogging experience in the State.

    When it comes to doing business, my  5  is “I love to see my customers smile”. If a customer smiles when he sees you, it means he feels comfortable  6 with you. More importantly, it means he makes money. If he can make money, I get the business rolling.

    On a personal note, my daughter's giggle(傻笑) is just like  7  which warms my inside the same way  8  the sun warms my body. It can  9  away any clouds and unpleasant feelings.  10 I see her photo, her giggle  11  around my ears. The little reserved and controlled smile of my wife,  12 , reflects the beauty of a matured and well-learnt woman. It is so  13  in my eyes. It can sometimes really turn me on.

    Julia Robert's  14 is nothing but roaring like earthquake or volcano. It can overtake men and women alike. Americans may  15 in many other ways, but they all agree that Julia is America's sweetheart. Nobody can 16 her laughter plays a very good part in her acting. Once I tried some candy in a store, the owner asked me how sweet the candy is, I said sweeter than Julia Robert. Both of us  17 into a kind of Julia's laughter.

    Yes, laughter is something we can not do without. Otherwise, our life would be too gloomy.

    Smiling does not belong to human alone. Once I stayed at an American home  18  he had a little doggy by the name of Mini. Mini is a lovely pet. Every time we came home, she jumped up and down and insisted  19 giving me some lipping. When I held her gently and asked her to give me a little smile, she just  20  her mouth and half closed her eyes, looking like every inch of smiling. That left a deep impression on me.

    What I love Los Angles most is not only it is the place where it has sunshine most days in a year but also where most people smile!

同类题5

任务型阅读

    Good morning everyone! Today I want to talk about how to deal with our children's homework. As we know, homework is a great way for children to develop learning skills. So as parents, you should pay attention to it.

    ____

    Avoid having your child do homework with the television on or in places with different noises, such as people coming and going.

    Make sure your child has all the materials he needs.

    Ask your child if special materials will be needed for some subjects and get them in advance.____

    Help your child use time properly.

    Tell them not to watch TV unless they finish their homework in time.____Don't let your child leave homework until just before bedtime.

    When your child asks for help, provide guidance, not answers.

    Giving answers means your child will not learn the material.____At the same time, you should keep in touch with teachers, which shows your child that the school and home are a team.

    ____

    If your child has been successful in homework and is working hard, celebrate that success with a special event to make him happy.

    I am sure your child will be interested in doing homework if you take my advice.

Thank you!

A. Praise progress in homework.

B. Tell your child how important homework is.

C. Make sure your child has a quiet place to do homework.

D. For example, you should buy some paper, pencils, dictionaries and so on when you do some shopping.

E. Make a set time each day for doing homework

F. Be positive about homework.

G. Too much help is bad for your child's study.