单项选择题

The author points out at the beginning that ______.

A．every child in hospital receives some teaching
B．not enough is known about hospital teaching
C．hospital teaching is of poor quality
D．the special children's hospitals are worst off

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热门试题

单项选择题

The author mentions the London cholera epidemic to ______.

A．prove that the city refused to deal with pollution
B．prove that medical science once knew little about pollution
C．introduce the idea of contaminated water supplies
D．recall a historical fact

单项选择题

In densely populated suburban areas, a danger exits from ______.

A．streams that do not flow directly to open bodies of water
B．cesspools and septic tanks that contaminate water supplies
C．storm and waste disposal sewers that have been combined
D．the undesirable odors of sewage