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【简答题】
Listen to the passage three times and supply the missing information.
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反馈参考答案：
举一反三
【简答题】常用 饮水 氯化消毒剂 有哪些?简述 影响饮水氯化消毒效果的因素 。
【单选题】What does the passage mainly tell us?
A.
The values are different between the old and the young.
B.
The moral problems raised by old people.
C.
The personal freedom for the old.
D.
Old people' s viewpoint on life.
【单选题】The old lady watched her grandson ____ a yo-yo yesterday afternoon.
A.
to play with
B.
to play
C.
playing with
D.
plays
【单选题】氯化消毒是我国目前饮用水消毒最常用的方式,供饮用水消毒的氯制剂主要有液氯、漂白粉、漂白粉精和有机氯制剂等,氯化消毒过程中起主要作用的物质是
A.
Cl 2
B.
HOCl
C.
OCl -
D.
Cl -
E.
NH 2 Cl
【单选题】The passage indicates that Alzheimer's is a disease ______.
A.
common to people, old and young
B.
not costly to be cured
C.
easy to be handled
D.
not easy to be diagnosed
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