题干

分子组成为C9H12的苯的同系物,苯环上只有一个取代基,下列说法正确的是(   )

A:该有机物不能发生加成反应,但能发生取代反应

B:该有机物不能使酸性高锰酸钾溶液褪色,但能使溴水褪色

C:该有机物分子中的所有原子可能在同一平面上

D:该有机物的一溴代物最多有11种

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D

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    Why do many people play sports? You might say “to get exercise'' and you'd be right. To have fun? That's true, too. But there's more.____According to the Women's Sports Foundation, girls who play sports get a lot more than just fit.

    Girls who play sports do better in school. ____But research shows that girls who play sports do better in school than those who don't. Exercise improves learning, memory, and concentration, which can give active girls an advantage in the classroom.

    Girls who play sports learn teamwork and goal-setting skills. Sports teaches valuable life skills. When you working with coaches, trainers, and teammates to win games and achieve goals, you're learning how to be successful. ____

    Sports are good for a girl's health. In addition to being fit and maintaining a healthy weight, girls who play sports are also less likely to smoke. And later in life, girls who exercise are less likely to get breast cancer.

    ____ Girls who play sports feel better about themselves. Why? It builds confidence when you know you can practice, improve, and achieve your goals. Sports are also a feel-good activity because they help girls get in shape, maintain a healthy weight, and make new friends.

    Exercise cuts the pressure. Playing sports can lessen stress and help you feel a little happier. How? ____ Friends are another mood-lifter. And being on a team creates tight bonds between friends. It's good to know your teammates will support you—both on and off the field!

A. Please take action to play games.

B. Playing sports boosts self-confidence.

C. Playing sports is good for your grades.

D. In fact, there are at least 5 more reasons.

E. Those skills will serve you well at work and in family life.

F. You might think that athletics will take up all your study time.

G. The brain chemicals released during exercise improve a person's mood.