单项选择题

This article is primarily about ______.

A．growing indoor plants
B．growing tropical plants
C．making containers for plants
D．choosing appropriate containers for indoor plants
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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
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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