[解析]
(1)D.根据Doctors say it isgood for us.lt makes your heart and body strong.Children who often exercise are smarter.That means they do better in exams and schoolwork than those who don't exercise.医生说这对我们有好处。它会使你的心脏和身体更强壮,这意味着他们在考试和学校工作方面比那些不锻炼的人做得更好,选项ABC都对。
(2)C.根据It's best to exercise twicea week.可知,一周最好锻炼两次,最好是锻炼一周两次。
(3)D.段落大意题。根据There are many ways to exercise.锻炼有很多种方式。有充分的锻炼。可知。故选D。
(4)B.词义猜测题。根据They have a lot of equipment there.The equipment will help exercise your arms,设备有助于锻炼你的胳膊,使你健康。故选B。
(5)C.主旨大意题。根据Everyone that is all to say is for It your and strong.Children often are means do in and than who exercise.每个人都知道锻炼很重要。医生说锻炼对我们有好处。经常锻炼的孩子更聪明。结合文章可知,呼吁大家多锻炼以保持身体健康。故选C。