问题
选择题
The scientists predict that if present trends____, women in 400 years will be 2cm shorter and have healthier hearts．
A．will continue
B．continue
C．are continued
D．will be continued
答案
答案：B
（if引导的真实条件状语从句常用一般现在时表示将来的概念，而主句要用将来时。）