题干

在等比数列{an}中,a2,a6是方程x2﹣34x+64=0的两根,则a4等于(   )

A:8

B:﹣8

C:±8

D:以上都不对

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答案(点此获取答案解析)

A

同类题5

阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空。

Are You Homesick(想家的)?

    Are you ready____leaving home? You can't help yourself feel less homesick. Here are some helpful ways:

    Bring a little bit of home with you

    If you are going away from home,____(bring) your pillow or your favorite pajamas(睡衣). You can also bring ____picture) of the people you'll miss and look at them when you want to.

Keep busy

    The more fun things you do, the ____ time you'll have to feel homesick, so you can try to join in some____(activity). Even if you are not completely(完全地) into them at first, you might soon start to have a good time.

Stay in touch

    You can plan ____ you'll call your mom or dad. If you have a two-day visit, maybe you need to stay out for a night. You'd better call ____(one) that night and again in the morning to make sure your parents know you're safe. With a camping trip, you might set a regular(规律的、定时的) day and time for a phone call home. You can also to stay in touch with your family and friends through the Internet. When you get in touch with someone, be____(sure) to talk about the funny things you're doing.

Talk to someone when you need to

    Sometimes, just telling someone that you're feeling a little homesick will help you feel better. Maybe you can tell a friend that you feel homesick and the two of you can do something fun---- like____(tell) each other jokes. If you're at camp, a camp teacher would be a good person to talk ____. He or she might have some ways to help you feel better.