47. What do the underlined words “pack out what you pack in” in Paragraph 4 probably mean?
A. keep every out of campgrounds
B. take away everything you bring in
C. carry all the necessary food
D. look after your personal belongings
48. Why were some deer killed on purpose at Grand Canyon?
A. They ate wrong things and became very ill.
B. They were a danger to other gentle animals.
C. They begged food from visitors.
D. They kicked and bit visitors.
49. What is the main purpose of the text?
A. To provide travel information B. To report some recent news.
C. To teach tourists hiking skills D. To introduce the wild life
参考答案46—49、BBAA
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