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

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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

答案

解析

略

举一反三

27. The town has a concert hall and two theatres. The _______ were both built in the 1950s.

A．later

B．latter

C．last

D．list

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There is no _____ that taking regular physical exercise is good for your heart.

A．need

B．sense

C．worry

D．doubt

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Recently our class held a fierce _____ as to whether cameras should be installed in public areas.

A．conflict

B．debate

C．bargain

D．contest

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It was reported that the problem had been settled without much .

A．affect

B．affair

C．effect

D．effort

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There has been no so far from the police about the cause of the poor girl’s death after the college entrance examination.

A．comment

B．command

C．discussion

D．reaction

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