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
Paper industry needed a new source of fiber in the early 1800s is because ______.
A．people wanted higher quality paper
B．paper made from rags deteriorated too quickly
C．wood pulp had become too expensive
D．the supply of rags was insufficient
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
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