按生产要素密集程度，企业划分为（）。
A.劳动密集型
B.资金密集型
C.知识密集型
D.合资经营
E.合作经营企业
参考答案：A, B, C
在欧洲西部被称为“绿色金子”的是 （ ）
A．水稻
B．牧草
C．葡萄
D．柠檬
He spends a lot of time on his research ____ basketball and chess. [ ]
A. as well as play
B. as well as playing
C. as well as to play
D. as well as played
