People who love trees may （）. A: never cause trees injury B: damage trees on purpose C: do harm to trees without knowing it D: not be aware of which trees are healthy

People who love trees may ______. A: never cause trees injury B: damage trees on purple C: do some harm to trees without knowing it D: not be aware of which trees are healthy

______ is fun and a great way ______ greenhouse gases. A: Plant trees, reduce B: Planting trees, to reduce C: To plant trees, reduce D: Planting trees, to reducing

Maple trees are thought to be fall color trees or foliage trees.

The purpose of the passage is to tell ______. A: that people should protect trees B: that people should plant more trees C: what trees can be used for D: what kinds of trees look beautiful

The essential difference between trees and grass is that trees are taller than grass.

Trees _ their leaves .

_____beautiful trees they are！

In addition to mulberry trees, ancient Chinese people often planted banyan trees near their houses.

Nice trees add to a house’s market value. One study showed that trees could ______.