Mary ______ that piece of cake for twenty yuan.
A. [A] spent
B. [B] cost
C. [C] bought
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It's a bird. But I don't know ______ name.
A. [A] it
B. [B] his
C. [C] its
Everything can't live ______ the sun.
A. [A] with
B. [B] without
C. [C] of
了解事物关系的角度对经验类化的迁移理论远行重新解释的学说是()。
A. 形式训练说
B. 共同要素说
C. 经验类化说
D. 关系转换说
People are asked ______.
A. [A] to read the book Safety in Flight
B. [B] to find out where they can smoke
C. [C] to buy something during the flight