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单选题

A．They have beneficial uses if contained.
B．They are destroyed in a later stage of APS processing.
C．They are both extracted during the first phase of APS digestion,
D．They are necessary to activate the anaerobic digestion process.

参考答案A

解析:暂无解析

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单选题回答题
Section A
Directions: In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. After you hear aquestion, you must choose the best answer from the four choices marked A, B, C and D. Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre.
Questions I to 4 are based on the conversation you have just heard.

A．Studying for a test.
B．Visiting a close friend of theirs.
C．A class presentation they're preparing.
D．The television programme the man is watching.

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单选题

A．He has already finished studying.
B．He's taking a break from studying.
C．He's looking for some information for a friend.
D．He was assigned to watch a programme by his professor.

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单选题

A．He thought she preferred to study alone.
B．He thought she had made arrangements to study with.
C．He had told her that he had done poorly on the last test.
D．He didn't know that she was enrolled in a linear algebra course.

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