题目内容

Experiencing native wildlife is ______ activity which is popular in modern times.

A. a
B. an
C. the

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Green travel is ______the popular trends to emerge over recent years.

A. one of
B. some of
C. any of

Green travel can_________ that our future generations can enjoy the same beautiful view as we can today.

A. ensure
B. be sure
C. become sure

equipment

crowd