单项选择题

Small green plants are very important to dry places because ______.

A．they don't let the sun make the earth even drier
B．they don't let the wind blow the earth away
C．they hold water
D．all of the above
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What can you do if you are not sure about the postage
A．You can buy stamps from machines.
B．You can buy different stamps of different prices.
C．You can ask the clerk for help.
D．You can put more stamps on the envelopes.
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There is ______ a post office in each town in Americ
A． hardlyB. usuallyC. nearlyD. almost
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