As a comet’s orbit brings it closer to the sun, first the comet grows, then two________tails usually form.

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问题 As a comet’s orbit brings it closer to the sun, first the comet grows, then two________tails usually form.

选项 A、dim
B、distinct
C、definite
D、descriptive

答案B

解析 当彗星的轨道接近太阳时,彗星先是变大,接着形成两条截然不同的尾巴。A项dim“模糊的,昏暗的”,B项distinct “截然不同的”,C项definite“确定的;明确的”,D项descriptive“描述性的”。
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