单项选择题

It’s up to you to decide （）you’ll go there .by air or by road.

A.how
B.why
C.that
D.when

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The north and the northwest of England are mainly（）。

A.farm land
B.lowland
C.highland
D.marshland

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Global warming threatens the （）of the whole human race.

A.summit
B.superiority
C.survival
D.status

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