赞题库-背景图
单项选择题

The harm radiation has done to the Apollo crew members ______.

A．is insignificant
B．seems overestimated
C．is enormous
D．remains unknown
<上一题 目录 下一题>
热门试题

单项选择题A．suchB．oneC．anyD．some

A．such
B．one
C．any
D．some

单项选择题A．student' sB．professor' sC．assistant' sD．librarian' s

A．student' s
B．professor' s
C．assistant' s
D．librarian' s