单项选择题

The main mountain range in the west of US stretching from the Canadian border to New Mexico is

[A] the Appalachian Mountains.
[B] the Rocky Mountains.
[C] the Green Mountains.
[D] the White Mountains.
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单项选择题
Human language can cope with any subject whatever, and it does not matter how far away the topic of conversation is in time and space. Which design feature of language does this phenomenon refer to
[A] Productivity.
[B] Cultural transmission.
[C] Displacement.
[D] Arbitrariness.
单项选择题
What should the children do to ensure the possession of their sites
A．Frequently change their passwords of online accounts.
B．Put their photos online frequently and randomly.
C．Guarantee the decency of language on their sites.
D．Use their read full name for their online account.
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