问题
选择题
The students are _______ to know that elephants can walk quietly on tiptoe.
A．surprising
B．surprised
C．frightening
D．frightened
答案
答案：B
题目分析：句意：学生们知道大象能静静的踮起脚尖走走很是惊讶。A. surprising令人惊讶，物做主语或修饰物 ；B. surprised惊讶的，人作主语 ；C. frightening令人害怕，物做主语或修饰物；D. frightened害怕，惊讶的人作主语。故选B。