紫外线的波长不同，皮肤的红斑反应亦不同，红斑反应最显著的波长_爱下问搜题

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问题单项选择题 A1/A2型题

紫外线的波长不同，皮肤的红斑反应亦不同，红斑反应最显著的波长（）

A.254nm

B.280nm

C.297nm

D.302nm

E.313nm

答案

参考答案：C

选择题

My good friend often make me .[ ]

A. happily

B. happy

C. to laugh

D. laughs

选择题

—Betty suggested going to the park instead of shopping this Saturday.

—That's right, because most shops in this town are _____ on weekends. [ ]

A. close

B. closed

C. open

D. opened