没有标准化就没有改善,改善的第一步就在于标准化。
A. 对
B. 错
It has now become clear how extraordinarily fecund a _______ was the 1890s.
A. September
B. December
C. decade
D. octopus
The sum of all the angles of a _________ is 180 degrees.
A. triangle
B. sexangle
C. enneagon
D. pantagon
I ____________ in Hawaii for ten years.
A. has been living
B. have been lived
C. has be lived
D. have been living