A:土壤溶液浓度小于细胞液浓度
B:土壤溶液浓度大于细胞液浓度
C:土壤溶液浓度等于细胞液浓度
D:土壤中的水分过多
My grandfather began to use the computer in his ____(六十多岁).
溶菌酶有杀菌的作用,是因为它能够( )
看图,给下列图片选择合适的句子或对话。
① ____ A. I have a new dress.
② ____ B. Look at my sweater. It's nice.
③ ____ C. My trousers are too long.
④ ____D. Look at his shirt. It's nice.
⑤ ____ E. In winter, I need a warm coat.
人体的密度最接近于下列哪种物质的密度( )
读德国鲁尔区和我国鞍山钢铁工业基地图,比较两地的区位特点,回答问题。