多项选择题

飞机起落架缓冲装置受压缩时（　　） A. 重力势能转换成压力能 B. 重力势能装换成热能 C. 压力能转换成重力势能 D. 热能转换成重力势能

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单项选择题

Which of the following statements is true about the cocktail party?
A、Cocktail refers to an alcoholic drink consisting of a spirit or spirits mixed with other ingredients, such as fruit juice or cream.
B、The cocktail party is usually held early in the morning.
C、The cocktail party is a very formal social gathering.
D、No food is served at a cocktail party.

Questions 9 to 12 are based on the conversation you have just heard
A、A) A historian.
B、B) A student.
C、C) A librarian.
D、D) An artist.

答案： D#我的B#我的答案：A#我的答案：C