半衰期（t0.5） 指反应物消耗一半所需的时间。（ ）
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有效期（t0.9） 指药物降解10%所需的时间。（ ）
A. 对
B. 错
[音频]When did Ang Lee come to understand his father’s concern about studying film?
A. When he applied to study film at the University of Illinois.
B. When he competed for available roles on Broadway.
C. When he boarded a flight to the US.
D. When he graduated from the film school.
[音频]What was Ang Lee’s most painful experience according to the passage?
A. Helping film crews with the equipment at the beginning of his career.
B. Working as editor’s assistant at the beginning of his career.
C. Being refused repeatedly by production companies when shopping a screenplay.
D. Struggling through six years of annoying, hopeless uncertainty.
[音频]
A. Because he wanted to learn some skills to be employed.
Because he was interested in computer.
C. Because his wife encouraged him to do so.
D. Because he thought it would help with moviemaking.
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