单项选择题

When Columbus______ America' s shores, he encountered copper-skinned people whom he promptly called "Indians".

A．landed
B．landed on
C．landed in
D．landed for
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单项选择题
He said it was impossible for______ a mistake in a computer' s calculation, so you can rely on that.
A．there being
B．there would be
C．there to be
D．there was
单项选择题
A scientist usually directs his attention towards problems which he notices have no satisfactory explanation, and his curiosity makes him look for______ relationship even if the data available seem to be unconnected.
A．underlining
B．underneath
C．undergoing
D．underlying
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