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
Paul suggested that (they meet) (in the front of) the school gate (at) one o'clock (Friday afternoon).
A．they meet
B．in the front of
C．at
D．Friday afternoon
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