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