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【单选题】
根据弗洛伊德的性心理发展理论,产生各种心理活动的原动力是A.
意识
B.
潜意识
C.
前意识
D.
无意识
E.
自我意识
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【单选题】---- Mary, could you come to our art club on Sunday. ---- __________.
A.
Sure, I'd love to
B.
Never mind
C.
You're welcome
D.
I'm sorry to hear that
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【简答题】A．10,000 pounds per year. B．It's very expensive. C．Nothing, it's free. D．2 pounds per day.
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【简答题】数列 为等差数列， 为，其前 项和为 ，数列 为等比数列，且 ，数列 是公比为的等比数列， . （1）求 ； （2）求证 .
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