单项选择题


The writer’s purpose of writing this article is to advise people

A．to use mobile phones less often.
B．to buy mobile phones.
C．to update regular phones.
D．to stop using mobile phones.
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单项选择题
The formation of the Isua supracrustal belt is thought to have started about 3.8 billion years ago.
A．Right
B．Wrong
C．Not mentioned
单项选择题
F
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