The gold medal will be awarded to ___________ wins the first place in the bicycler.
A. whomever
B. wherever
C. whoever
D. whatever
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At the beginning of a speech, it is very important to grab the audience's attention and make them interested in ______ you have to say.
A. which
B. what
C. that
D. who
We must find out ____ Jackson is coming, so we can book a room for him.
A. when
B. how
C. where
D. why
I wonder ________ Mary has kept her figure after all these years.—By working out every day.
A. where
B. how
C. why
D. if
简述渗透压的形成原理,并分析我们平时喝的纯净水是如何得到的。