．lifebeganontheearthisoneofthe

．_________life began on the earth is one of the biggest puzzles to scientists.

A．How

B．What

C．Where

D．That

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相关试题

Great changes ______ in the past few years, and a lot of factories ________.

A．had taken place; have been set up	B．have taken place; have been set up
C．took place; have set up	D．were taken place; were set up

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—What about going for a walk?
—______.

A．Go ahead, please

B．Me, too

C．Help yourself

D．Good idea

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______ with routine office tasks, she had no time to look after her children.

A．Occupying

B．Occupied

C．Being occupied

D．To be occupied

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The audience ______ to see who would win the gold medal.

A．took a deep breath	B．held their breath
C．lost their breath	D．was out of breath

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Dr. Peter Spence, headmaster of the school, told us, “ fifth of pupils here go on to study at Oxford and Cambridge.”

A．/；A

B．/；The

C．the; The

D．a; A

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