单项选择题

According to the passage, it is true that ______.

A．vegetables are easier to grow than flowering plants
B．the growth of indoor plants can be adjusted by adequate light and temperature
C．most indoor plants live from three to five years
D．plants growing indoors need little care

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单项选择题

The phrase build on in the last parapraph most probably means ______ .

A．rely on
B．give up
C．conduct an investigation into
D．pay great attention to

单项选择题

The passage indicates that the conditions that led to overcrowded roads also brought about ______.

A．more attractive living conditions for many people
B．a healthier younger generation
C．greater occupational opportunities
D．the population explosion