单项选择题


Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20.
"Shelter" refers to

A．safe.
B．shell.
C．house.
D．income.
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单项选择题
Which title best gives the ideas of the passage
A．Americans Like Reading.
B．"How To" Book, a True Friend.
C．"How To" Book Is Popular.
D．Americans Like Books.
单项选择题
A．withinB．insideC．onD．at
A．within
B．inside
C．on
D．at
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