肾脏的主要功能是( )
A.输送尿液
B.形成尿液
C.储存尿液
D.排出尿液
答案:B
There __________ two football matches on TV tomorrow.[ ]
A. is going to have
B. will be
C. is going to be
D. will have
某图的编号是J-49-127-(4),它的比例尺为()。
(A)1∶100000;
(B)1∶50000;
(C)1∶200000;
(D)1∶10000。