单项选择题

In paragraph 3, sentence 2, the author compares water to molasses in order to introduce which of the following topics（）

A．The bacterial content of different liquids.
B．What happens when bacteria are added to molasses.
C．The molecular structures of different chemicals.
D．How difficult it is for bacteria to move through water.

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单项选择题

Some people oppose the building of flats because（）

A．it is dangerous for children to play on the top of buildings
B．they have to spend a lot of money and time on the journeys to work
C．they believe people like to live in houses with gardens
D．the disposal of rubbish remains a problem for those living in flats

单项选择题

What is said about the blocks of flats built in the past in Britain（）

A．They were mostly inhabited by people who did not earn much.
B．They were usually not large enough to accommodate big families.
C．They were sold to people before necessary facilities were installed.
D．They provided playground for children on the top of the buildings.