单项选择题

The()of the flood, which caused thousands of people to lose their houses, was 3 weeks of torrential rain.

A. source
B. origin
C. root
D. resource

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单项选择题
Very few people could understand the lecture the professor delivered because its subject was very ().

A. intriguing
B. indefinite
C. obscure
D. dubious
单项选择题
America will never again have as a nation the spirit of adventure as it()before the West was settled.

A. could
B. did
C. would
D. was
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