单项选择题

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A. To inform visitors of the park’s history.
B. To provide an overview of the park’s main attractions.
C. To show visitors remote places in the park.
D. To teach visitors how best to photograph wildlife.
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单项选择题
A. One may be doing something quite difficult.B. One may be doing something quite risky.C. One may be doing something quite annoying.D. One may be doing something impossible.
A. One may be doing something quite difficult.
B. One may be doing something quite risky.
C. One may be doing something quite annoying.
D. One may be doing something impossible.
单项选择题
A. Writing papers for his classes.B. Meeting with his professors.C. Doing extra work in the chemistry lab.D. Working overtime as a librarian.
A. Writing papers for his classes.
B. Meeting with his professors.
C. Doing extra work in the chemistry lab.
D. Working overtime as a librarian.
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