单选题 As the artist was ______ to pollen, he seldom went into the country to sketch the natural beauty in spring.

【正确答案】 B

【答案解析】[解析] 各项的意思是：destructive“对……有破坏力的”；allergic“过敏的”，be allergic to sth.“对某物过敏”；fragile“脆弱的，易碎的”；unchallenged“未引起质疑的”。