单项选择题

Which river is the longest river in the V. K. that rises in the mountains of Wales

[A] The Thames River.
[B] The Severn River.
[C] The Clyde River.
[D] The Mersey River.

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单项选择题

Wijngaarden will further focus his research on whether

A．there is a definite relationship between high levels of lead and death.
B．the patients with brain tumors have higher levels of lead in their bones.
C．some workers have higher risks of developing brain cancers than others.
D．higher levels of lead have a long-term effect on children over a lifetime.

单项选择题

The famous short story The Fall of the House of Usher was written by

[A] Charles Dickens.
[B] Edgar Allan Poe.
[C] Washington Irving.
[D] Thomas More.

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