单项选择题

Since this road is wet and slippery this morning, it_________ last night.

A．must rain
B．was raining
C．must have rained
D．may rain

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单项选择题

The best title for the passage may be________.

A．Garbage and the Earth
B．Fossil Fuel and Garbage
C．Land and Garbage
D．Garbage—Energy Source

单项选择题

Which of the following may be the best title for the passage

A．When Was the Umbrella Invented
B．The Role of Umbrella in History
C．The Colors and Shapes of Umbrella
D．Who Needed Umbrella First

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