单项选择题


A．principally
B．particularly
C．generally
D．primarily
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单项选择题
Einstein's (relativity) theory is the (only one) (what) can explain such (phenomena).
A．relativity
B．only one
C．what
D．phenomena
单项选择题
Scientists and economists (believe) that human being (can never) (use away) all the (mineral) resources on Earth.
A．believe
B．can never
C．use away
D．mineral
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