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【单选题】
There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D given in your test paper.A.
He has returned from home for a conference.
B.
He’ l l have a conference next Friday.
C.
He's waiting for the man in his office.
D.
He won't be available until next Friday.
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举一反三
【简答题】持久性污染物作为极性较弱的半发挥性有机化合物，其分析程序一般包括()、()和()三个步骤。
【多选题】我们常说年轻人“血气方刚”,可以用来形容( )?请选择。
A.
年轻人是气血最旺盛时期
B.
年轻人是精力最充沛时期
C.
年轻人是最易冲动时期
D.
年轻人是一生中形体最壮盛时期
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