单项选择题

The author implies that ______.

A．plants in containers have less varieties of form
B．plants can be damaged if they are given too much water
C．most plants should be placed on window sills during winter months
D．some plants are particularly fit for container gardening

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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

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