单项选择题

It is believed that plants need ______.

A．extra water
B．more sunlight
C．more nutrient
D．enough warmth
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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
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