Modern plant breading is largely based on planned hybridization combined with_____selection to speed up the evolution of new varieties.
A. stringent
B. stern
C. emergent
D. austere
2002年全国工业增加值为多少亿元人民币?()
A. 314.8
B. 31428.5
C. 314285
D. 314.285
According to the recent census, under-18s____nearly 95% of the single children in Chinese
A. compose
B. institute
C. prescribe
D. constitute
从以上资料中可以看出,2003年我国有关商品房的投诉比2002年同期增加()
A. 20%
B. 23%
C. 23.4%
D. 24%