问题
选择题
Elephants eat________, but they can move _______when necessary.
A．noisy; silent
B．noisily; silently
C．noisily; silence
D．noisy; silence
答案
B
副词的用法。eat和move皆为行为动词，故用副词来修饰，noisy，silent为形容词，silence为名词；而noisily 和silently均为副词，故选B。