A-A+
How could Dennis distinguish between a book an
问题详情
How could Dennis distinguish between a book and a pillow of the same size and at an equal distance in front of him？ A book would produce ______.
A．a higher-pitched sound
B．a louder sound
C．a sharper sound
D．a fuzzier sound
参考答案
正确答案：C
解析：该题问：Dennis如何区分相同大小，且在他面前相同距离的一本书和一个枕头?书会发出怎样的声音?A项意为“更高的声音”；B项意为“更大的声音”；c项意为“更尖利的声音”；D项意为“更加柔软的声音”。从本文的第五段也可找到线索：Hard surfaces produce a sharp ping，while soft ones send back signal with a slightly fuzzy quality。因此可判定C项为正确选项。
