单项选择题

When traveling , you are advised to take travellers' checks, which provide a secure ___________to carrying your money in cash.

A．substitute
B．selection
C．preference
D．alternative
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单项选择题
Language, culture, and personality may be considered ______________of each other in thought, but they are inseparable in fact.
A．indistinctly
B．separately
C．irrelevantly
D．independently
单项选择题
Dozens of scientific groups all over the world have been ___________the goal of a practical and economic way to use sunlight to split water molecules.
A．pursuing
B．chasing
C．reaching
D．winning
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