单项选择题

I was unaware of the critical points involved, so my choice was quite （）.

A．artistic
B．artificial
C．arbitrary
D．mechanical

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Experts say the space rock is probably （） more than $ 30,000.

A．weighty
B．costly
C．valuable
D．worth
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The architectural differences may （） confusion or discomfort for the foreign travelers.

A．vary
B．describe
C．cause
D．impress
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