单项选择题

A．They should help maintain the equipment.
B．They should keep a watchful eye on their children.
C．They should stop their children from climbing ladders.
D．They should teach their children how to use the equipment.
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单项选择题
The first paragraph of the text deals mainly with the earth atmosphere’’s.
A．sheltering effect
B．reviving effect
C．invigorating effect
D．cleansing effect
单项选择题
A．Registration at a polytechnic.B．The length of his stay in this country to be allowed.C．The way to open a bank account in Britain.D．The course he intends to have next year.
A．Registration at a polytechnic.
B．The length of his stay in this country to be allowed.
C．The way to open a bank account in Britain.
D．The course he intends to have next year.
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