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单选题
In some parks visitors are requested to keep（）the grass.
A
aside
B
away
C
out
D
off
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单选题What are they ， ， . -- It’s a secret. But I’11 give you some hints， anyway.（）A
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Should National Parks Allow the Use of Cell Phones?C
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Can Technology Transform the Way People Experience Nature?
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The number of the visitors has decreased this year.C
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Rushing through some assignments.D
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demonstrate the cultural differences between America and EuropeB
indicate ways to improve the American image abroadC
describe the general impression of foreign visitors on AmericaD
criticize some behaviors of American taxi drivers
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