情感是学习的（）
A.动力—评价系统
B.快乐基调
C.不畏艰难
D.不知疲倦
参考答案：A
The grocery has built a reputation on selling fresh organic produce _____ chemicals.[ ]
A. far from
B. free from
C. close to
D. different from
细胞连接（celljunction）
