[单项选择]Why do working conditions generally remain bad
A. The workers are quite satisfied with them.
B. No one can decide what to do about them.
C. Managers see no need to change them.
D. Office workers want to protect their position.

[单项选择]Working conditions generally remain bad because.
A. the workers are quite satisfied with them.
B. no one can decide what to do about them.
C. managers see no need to change them.
D. office workers want to protect their position

[单项选择]You（　）television. Why not do something more meaningful
A. always watch
B. are always watching
C. have always watched
D. have always been watching

[单项选择]Why do Americans love time

[单项选择]Why do companies take downsizing
A. Because this is an inevitable tide throughout the world.
B. Because incompetent employees must give their way to new competent ones.
C. Because it is a direct way to reduce cost.
D. Because those employees are too old to work efficiently.

[单项选择]

Why does cream go bad faster than butter Some researchers think they have the answer, and it comes down to the structure of the food, not its chemical composition — a finding that could help rid some processed foods of chemical preservatives.
Cream and butter contain pretty much the same substances, so why cream should sour much faster has been a mystery. Both are emulsions — tiny globules (小球) of one liquid evenly distributed throughout another. The difference lies in what’s in the globules and what’s in the surrounding liquid, says Brocklehurst, who led the investigation.
In cream, fatty globules drift about in a sea of water. In butter, globules of a watery solution are locked away in a sea of fat. The bacteria which make the food go bad prefer to live in the watery regions of the mixture. "This means that in cream, the bacteria are free to grow throughout the mixture," he says.
When the situation is reversed, the bact
A. it suggested a way to keep some foods fresh without preservatives
B. it discovered tiny globules in both cream and butter
C. it revealed the secret of how bacteria multiply in cream and butter
D. it found that cream and butter share the same chemical composition

[单项选择]Why do the critics criticize advertisers
A. Because advertisers often brag.
B. Because critics think advertisement is a "waste of money".
C. Because customers are encouraged to buy more than necessary.
D. Because customers pay more.

[单项选择]Why do visitors come to Venice
A. To realize their dreams.
B. To see the architecture and paintings only.
C. To enjoy the unique characteristics of the city.
D. To float on the water.

[单项选择]Why do some people become vegetarians
A. They feel that eating animals is unethical.
B. There are fewer livestock available due to the environmental pollution.
C. The consumption of meat will lead to financial problem.
D. Being a vegetarian is beneficial to the protection of water.

[单项选择]Why do workers want more money
A. Because their jobs are too boring.
B. In order to enjoy more spare time.
C. To make their jobs more interesting.
D. To demand shorter working hours.