秦岭――淮河一线大致同 。[ ]
A、一月0℃等温线一致
B、热带、亚热带分界线一致
C、400毫米年等降水量线一致
D、半湿润区与半干旱区分界线一致
答案:A
着丝粒指数可用下面哪个公式×100%表示()
A.q/p
B.p/q
C.(p+q)/q
D.q/(p+q)
E.p/(p+q)
— Inventors have changed the way we live.
— So they are famous for the great things they _____. [ ]
A. do
B. did
C. are doing
D. had done