All of the plants now raised on farms, have been developed from plants ()wild.
A. once they grew
B. they grew once
C. that once grew
D. once grew
()是指当地地下水的开采利用情况,地下水埋深,地下水与地面的联系以及水质状况与污染来源。
A. 大气环境
B. 土壤环境
C. 地面水环境
D. 地下水环境
About 85 percent of the students() good, and part of them() interested in biology.
A. is; are
B. are; are
C. are; is
D. is; is
A.repeatB.threadC.teachD.reader