Noonehasyetsucceededinsolvingt

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No one has yet succeeded in solving the _____ of how life first began.

A．biology

B．gravity

C．puzzle

D．theory

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相关试题

Only by shouting at the top of his voice, ___.

A．he was able to make himself hear

B．was he able to make himself hear

C．was he able to make himself heard

D．he was able to make himself heard

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The hill ____ is covered with tress is called Huang Hill.

A．of which top	B．whose the top
C．whose top	D．top which

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Progress so far has been very good, ____, we are sure that the project will be completed on time.

A．otherwise

B．therefore

C．besides

D．however

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All of us don’t believe the fact__ our best student failed in the competition.

A．that

B．which

C．when

D．why

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-----I forget the name of an old school friend at the party.
-----_____. It must have been very embarrassing.

A．Take it easy	B．That’s too bad
C．Nothing serious	D．Don’t mention it

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