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．a(chǎn)re continuedD．will be continued
B
（if引導(dǎo)的真實條件狀語從句常用一般現(xiàn)在時表示將來的概念，而主句要用將來時。）
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