C　[推理判断题。根据第三段的第一句话"Experts say that to stay healthy，children need at least one hour of moderate exercise every day."和第四段的介绍可知，只有C项没有提及。]

　　2．Parents don't allow their children to ride a bike to school mainly because ．

　　A．their children don't want to

　　B．they aren't worried about their children's safety

　　C．they don't know what size bike to choose

　　D．they are afraid of their children's safety

　　D　[细节理解题。根据第五段最后两句"Safety is the number one worry for them.But actually riding a bike is not as dangerous as parents think it is."可知答案。]

　　3．Generally，what size bike is suitable for a 10­year­old child?

　　A．A bike with 20­inch wheels.

　　B．A bike with 24­inch wheels.

　　C．A bike with 26­inch wheels.

　　D．A bike with 28­inch wheels.

　　B　[细节理解题。根据最后一段中的"24­inch wheels are for 9～11 year olds"可知答案。]

IV.阅读七选五

　　Laughing is the farthest from our minds when things are not going good.We consume ourselves in sadness，tears and anger.Laughter is healthy. 1 Why can't we learn to laugh? It is okay to do so.Here are some ways to make that happen：

　　Call or visit your best friend

　　 2 Reminisce(追忆) on funny times together and laugh a hearty laugh.If your best friend is not available，sit in your living room or in your bedroom and remember all the funny things you have experienced throughout your life.Laugh as loud as you can.

Surround yourself with positive people