提倡老年人应多吃些鱼，主要是因为鱼（ ）。
A．热量含量高
B．饱和脂肪酸较多
C．饱和脂肪酸较多
D．口感好，且易消化
参考答案：C
_____ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
A．Even if
B．As far as
C．If only
D．So long as
