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

According to this passage, one early step in any effort to improve the environment would be to ______.

A．return to the exclusive use of natural fertilizers
B．ban the use of automobiles in and around cities
C．study successful effort in other countries
D．set up a timetable for collective actions