These discoveries have opened up new______in the field of cancer research.

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问题 These discoveries have opened up new______in the field of cancer research.

选项 A、rainbows
B、horizons
C、altitudes
D、paradoxes

答案B

解析 该句意为:这些发现为癌症研究领域开辟了可实现的新目标。rainbow:彩虹;horizon:地平线,视野,可做到的事情;altitude:高度;paradox:自相矛盾
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