方言
参考答案：
是共同语的地域分支，指在某一个地方通行的语言。
In big cities of China, students often ________ bikes, ________ buses or walk to school. [ ]
A. on; by
B. ride; take
C. ride; on
分化发育为 * * 下1/3的是
A．副中肾管B．尿生殖窦C．尿生殖褶D．生殖结节E．生殖隆突
