单项选择题

The main idea of this passage is ______.

A．children despise their parents
B．the distinction between parents' duties and the children's
C．over-devotion to the children results in trouble for the parents themselves
D．how a loafer is produced

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单项选择题

The article mainly discusses ______.

A．devices that enable astronauts to control their spacecraft
B．the value of the systems approach
C．practical applications of space research
D．ways of monitoring patients

单项选择题

The word such in Paragraph 2 refers to ______.

A．spin-offs from space research
B．research in hospitals
C．research in doctors offices
D．handicapped people