题目内容:
Questionsarebasedonthepassageyouhavejustheard.
A.Theyarepossiblyashealthyastheirinactivepeers.
B.Theyarepossiblytwicehealthierthantheirinactivepeers.
C.Theyarepossiblythreetofourtimeshealthierthantheirinactivepeers.
D.Theyarepossiblyfourtofivetimeshealthierthantheirinactivepeers.
参考答案:
答案解析: