单项选择题

A．It affects the growth of trees.
B．It has been increasing since the Ice Age.
C．It is determined by the chemicals in the air.
D．It follows a certain cycle.
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单项选择题
On roads painted with chevrons, drivers tend to feel that ________.
A．they should avoid speed-related hazards
B．they are driving in the wrong lane
C．they should slow down their speed
D．they are approaching the speed limit
单项选择题
A．The race was not very hard.B．The race was very hard.C．The Deer and the Rabbit would have to run around a large tree.D．They would have to run on one side of the forest.
A．The race was not very hard.
B．The race was very hard.
C．The Deer and the Rabbit would have to run around a large tree.
D．They would have to run on one side of the forest.
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