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It still puzzles today’s scientists ______ some mammals produce their young ______ others lay eggs to produce their offspring( 后代)

A．that; while

B．why; while

C．how; when

D．what; as

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News got around quickly_____ a gunman went on a shooting rampage at a movie theatre in Aurora, Colorado.

A．which

B．what

C．that

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____, as long as I’m with nature, I don’t care.

A．However tough the journey is

B．Whatever tough the journey is

C．However the journey is tough

D．Whatever the journey is tough

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A．have

B．to have

C．has

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—Because large quantities of water________．

A．have polluted	B．is being polluted
C．has been polluted	D．have been polluted

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The horse covered the distance in six days_____ the train's 28 hours.

A．comparing with	B．being compared with
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