区分外太空和大气层的卡门线高度为（） A.海拔60公里 B.海拔80_爱下问搜题

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问题单项选择题

区分外太空和大气层的卡门线高度为（）

A.海拔60公里

B.海拔80公里

C.海拔100公里

D.海拔120公里

答案

参考答案：C

单项选择题 B型题

双股DNA病毒（）

A.脊髓灰质炎病毒

B.流行性乙型脑炎病毒

C.疱疹病毒

D.乙肝病毒

E.柯萨奇病毒

选择题

Hardly _____ to the airport _____ he was surrounded by many journalists and fans.

A. the famous singer had got; when
B. the famous singer got; then
C. had the famous singer got; when
D. did the famous singer get; then