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抗体保健中心进行了为期20周的减肥实验。结果显示，参加者平均减肥10千克。其中，男性参加者平均减肥14千克，女性参加者平均减肥8千克。
如果以上陈述是真的，并且其中统计数据是精确的，则以下哪项也一定是真的?( )

A.所有参加者体重均下降
B.男性参加者和女性参加者一样多
C.女性参加者比男性参加者多
D.男性参加者比女性参加者多
【参考答案】

C
解析：设男性参加者为x人，女性参加者为y人，14x+8y=10(x+y)，解得，y=2x，可知，女性参加者比......

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未知题型
听力原文：W: Hello. What's all this then, Harry?
M: What's all what? I'm making a cakE.
W: Yes. We can see what you're up to. Obviously you're making a cakE.What else would you be doing with a cake tin and a rolling pin on the table and the place absolutely covered in flour? Yes, we can see what you're doing. But why are you doing it?
M: Well, I just decided I'd try and make one for a change instead of buying onE.Anyway this is going to be a rather special sort of cakE.You can't buy them like this. And while you're here, Doris, do you mind beating up half a dozen eggs in that blue bowl over there? You'll find a fork and egg whisk, whichever you prefer, in the drawer on the left.
W: OK. I don't minD.But what's so special about this cake?
M: It's a surprise cakE.
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M: Yes. Doris, don't forget to add five spoons of sugar.
W: No, dear. But tell us about this surprise cakE.
M: Well, it was an idea I had while I was lying in bed last night.
W: Do you usually think of food in bed?
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W: What kind of surprise?
M: Can you add a half of a pint of cream to that, Doris? That's right, drip it in slowly and then beat it up again until it becomes all sticky. That's the way.
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