脊椎动物和无脊椎动物相比,结构要复杂,物种和数量要多。[ ]
×
My neighbour a new baby. [ ]
A. have
B. is
C. has
庆大霉素().
A.四环素
B.反应停
C.氯霉素
D.新生霉素
E.磺胺