Betty likes running and she_____ likes swimming. [ ]
A. also
B. too
C. is
D. either
答案:A
婴幼儿突然恶心、呕吐,厌油腻,有可能是()的表现。
A、贫血
B、传染性肝炎
C、VA中毒
D、腮腺炎
话音信号的频率范围约为50至10000Hz,而其主要能量集中在()
A.100至2000Hz
B.300至3400Hz
C.1000至5000Hz
D.2000至5000Hz