Attention！Sunshine Language Learning Centre will set a course and it will teach Pure（纯正的） British English. Maybe you've known some British expressions are quite different from American ones。British people use “autumn” for “fall”, “film” for “movie”. “holiday” for “vocation”, “garden” for “yard”. etc

    There are more typical（典型的）expressions that you may not know. Here are Mr. Bean's examples.

    Are you interested in it? Do you want to learn? You can learn British English well if you put much effort into it. We have some native British English teachers with much experience to help you.

    The course will be open in the coming summer holiday. The price of the course is not very high: ￥500 for one person; ￥900 for two（10% off）; ￥1,200 for three (20% off); for four or more(30% off).

    For further details, call 400-810-2345 or search http://www.BEcourse.com. Come and join us!

用相同的完全培养液，在相同条件下分别培养水稻和番茄幼苗．在二者的吸水率几乎相同的情况下，72h后原培养液中部分离子浓度发生了如下表所示的变化（表中数据为72h后溶液中部分离子浓度占实验开始时的百分比）．分析下表不能得出的结论是（　　）

我国第二级和第三级阶梯的分界线是（　　）