14周岁的张飞面色较黑，外表成熟，常被人误认为已逾20周岁，其研究创造的发明获得专利，该专利的市场估价是10000元，张飞将该专利以20000元的价格转让给某企业，用转让所得的 200元购买继续进行相关创造的材料，用6000元购买电脑一台，张飞的上述行为均未告诉父母，而对父亲谎称买彩票中了10000元奖金，张飞的父亲遂将3000元以张飞名义捐献给某贫困地区的希望小学。则下列说法中正确的是：( )
A. 张飞购买材料的行为效力未定
B. 张飞的父亲捐款的行为合法有效
C. 张飞转让专利的行为无效
D. 张飞购买电脑的行为效力未定
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The message the author wishes to convey in the passage is that ______.
A. human civilization remains gorious though it is affected by climatic changes
B. mankind is virtually helpless in the face of the dramatic changes of climate
C. man has to limit his activities to slow down the global warming process
D. human civilization will continue to develop in spite of the changes of nature
Mary ______that piece of cake for twenty yuan.
A. [A] bought
B. [B] cost
C. [C] spent
If you want to try for a job of a secretary in Fairemont Hotel, you______.
A. [A] have to be a woman and know foreign languages
B. should be younger than 40 years old
C. have to be taller than 1.70 meters
投资变化所导致的国民收入的成倍增加现象，被称为（）。
A. 加速效应
B. 挤出效应
C. 乘数效应
D. 政策效应
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