单项选择题

When did Daylight Saving Time become observed nationally

A．In 1966.
B．In 1960.
C．In 1948.
D．In 1939.
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单项选择题
From the passage, we can infer that the first wood pulp mill in Canada ______.
A．turned out high-quality paper
B．used wood imported from the United States
C．caused a serious environmental problem
D．was a ready market for its product
单项选择题
According to the speaker, libraries are facing the problem of ______.
A．books are in poor condition
B．having too many books from the early 1800s
C．not having enough space to store government documents
D．having to import most of the paper they use
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