题干

在生物组织中还原糖、脂肪、蛋白质的鉴定实验中,对实验材料选择的叙述中,错误的是(  )

A:甘蔗茎的薄壁组织、甜菜的块根等,都含有较多的糖且近于白色,因此可以用于进行还原糖的鉴定

B:花生种子含脂肪多且子叶肥厚,是用于脂肪鉴定的理想材料

C:大豆种子蛋白质含量高,是进行蛋白质鉴定的理想植物组织材料

D:鸡蛋清含蛋白质多,是进行蛋白质鉴定的动物材料

上一题 下一题 0.0难度 选择题 更新时间:2010-07-04 06:58:11

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A

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Tips for Upcoming Senior Two

    People often describe Senior Two as a year with “much more homework, more frequent exams and more fierce competitions”.____

    ⒈Manage your time carefully and make full use of it.

    Try to study not hard but efficiently. Make a to-do-list for your time after school. Don't just spend quite a long time on only one subject.____Remember to take breaks when you feel exhausted.

    ⒉Treat Competition in Class in a right way.

    Don't treat your classmates as potential(潜在的)enemies. Competition cannot be avoided, but everyone wants to study and live in a friendly environment.____By helping others solve problems, you inspire others, enrich your own knowledge and gain lasting friendship.

    ⒊____

    Don't let your former rankings limit you. What really matters is how you treat exams and ranking. Forget the class ranking or grade rankings, but compete with yourself. In a while, you will see yourself climbing in scores and rankings.

    All in all, the coming new school year is sure to be full of challenges. Too much worry only adds to your difficulties in your development.____Wish you the best of luck in the new academic year!

A. Learn for yourself, not for others.

B. Have a right attitude towards your rankings.

C. Good time management skills are very important.

D. Instead, divide the hours into small periods for different subjects

E. When you prepare for the battle, some advice from me may be of help

F. So when they turned to you for help, just share your wisdom immediately

G. If you keep my advice in mind, you will achieve a lot and lead a happy life.