[单项选择]Why a democracy on every decision may also cause problems
A. It creates few opportunities for employees.
B. It is controlled within the family.
C. Small committees have to be set up.
D. Sometimes there are too many people involved in decision makin

[单项选择]Why may partial theories be completely wrong

[单项选择]Why may local people look hungrily at the game reserves


A. They may wish to visit them frequently.
B. They may seek land for their own cultivation(耕种).
C. The animals may be a danger to them and their village.
D. They may dislike living in a deserted place.

[单项选择]Why may GM foodstuffs be liked by people in the future

[单项选择]What may probably cause the Watergate Scandal


A. The presidential campaign in 1972.
B. American involvement in Indochina.
C. The signing of the treaty to limit strategic nuclear weapons.
D. The entry into the offices of the Democratic National Committee by force.

[单项选择]Why might the increasing number of whales cause problems with their health

[单项选择]Why did so may Ugandans die in faith

[单项选择]Antipsyehotie medications may cause which of the following adverse effects
A. Increased production of insulin.
B. Lower seizure threshold.
C. Increased coagulation time.
D. Increased risk of heart failure.

[单项选择]Why did French artist Marcel Duchamp exhibit everyday, mass-produced, utilitarian objects—including a bicycle wheel and a urinal—as works of art


A. Because he liked to do so.
B. He wanted to claim that modern art was by nature rebellious and that this rebellion was most evident in a quest for originality and a continual desire to shock.
C. He wanted to suggest that art was what was new, original, or cutting-edge.
D. To be sure, many artists in the 20th century tried to redefine what art means, or attempted to expand the definition of art to include concepts, materials, or techniques that were never before associated with art.

[单项选择]According to the passage, what may cause the periodic change of certain plants

[单项选择]

Doctors believe that second-hand smoke may cause lung cancer in people who do not smoke. Nonsmokers often breathe in the smoke from other people's cigarettes. This is second-hand smoke. The U. S. Environmental Protection Agency (美国环保局) reports that about fifty-three thousand people die in the United States each year as a result of exposure (暴露) to second-hand smoke.
It is harder for children to avoid second-hand smoke. In the United States, nine million children under the age of five live in homes with at least one smoker. Research shows that these children are sick more often than children who live in homes where no one smokes. The damaging effects of second-hand smoke on children also continue as they grow up. The children of smokers are more than twice as likely to develop lung cancer when they are adults as children of nonsmokers. The risk is even higher for children who live in homes where both parents smoke.
People are becoming very aware of the danger o
A. Because people have realized the danger of second-hand smoke.
B. Because more and more people don't like smoking now.
C. Because parents don't want their children to become smokers.
D. Because the government wants to limit the production of cigarettes.