The first watermill was horizontal and resembled a rudimentary turbine.
A．a flat
B．a rusty
C．an unconventional
D．an unsophisticated
请帮忙给出正确答案和分析，谢谢！
At first, the speaker was referring to the proble
At first, the speaker was referring to
Thomas Jefferson was the first president of America.（)
Who was the first man to reach the summit
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