考高分3._____ they are close friends is not clear though they live together.
A.That
B.If
C.What
D.Whether
考高分4._____ sculpture is to a block of marble, education is to a human soul.
A.That
B.Which
C.What
D.Where
考高分3.答案是D；whether可以引导主语从句、表语从句、宾语从句和同位语从句，而if只可引导宾语从句，表示是否。
考高分4.答案是C；考查固定句型：A is to B what C is to D，意为：A对B而言就像C对D而言一样。
