肾上腺转移癌最常来自()
A．肝癌
B．胃癌
C．结肠癌
D．肺癌
E．乳腺癌
参考答案：D
My best friend often _____________ to school by bus. [ ]
A. go
B. going
C. goes
下列化学符号的读法与写法相符的是
A．硝酸铜 CuNO3
B．高锰酸钾K2MnO4
C．铵根离子 NH4＋
D．二个氮原子N2
