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
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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
单项选择题
(Only) (in this way) (we can) (win the match).
A．Only
B．in this way
C．we can
D．win the match
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