Many people are ______airborne pollutants such as pollen. ______, scientific research has found out that pollen is nutritious fo

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问题 Many people are ______airborne pollutants such as pollen. ______, scientific research has found out that pollen is nutritious for human beings.

选项 A、allergic to: However
B、indispensable to: On the contrary
C、immune to: However
D、vulnerable to: On the contrary

答案A

解析 句意:许多人对空气传播的污染物过敏,比如说花粉。然而,科学研究发现花粉实际上是很有营养的。be allergic to对……过敏。be indispensable to对……必不可少。be immune to对……有免疫力,可避免……。be vulnerable to易受……的伤害。onthe contrary相反,正相反。
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