—What       the number of the students in your class ?

—About 60 . A number of them       girls .

    Do you know what may make you seem to be not confident enough?____.

    Giving reasons for your actions. Suppose you are having lunch with a group of people, and suddenly you drop your glass of coke on the floor. What will you do? Well, some people will just start to explain why it has happened.____ If you drop a glass or make a mistake, it won't change who you are. It's your right to make a mistake because you are a human being.

    ____ You may have experienced a situation where you told a friend his performance wasn't that good and then he replied back immediately by saying, “No, no, no, it's just because I was tired” or “I was just thinking of something else”. Confident people listen to criticism and see whether it's true or not.____ However, if they know it's not true, they don't care much about it.

    Becoming a perfectionist. A perfectionist thinks that he lives in a perfect world so he tries to do everything perfectly.____ Confident people are not perfectionists. If they get a “B”, they may try to get an “A” next time, but if they get 99/100, they won't be unhappy about not getting a full mark because they know they're not perfect.

A. Confident people don't give reasons for their actions.

B. Read the following information and you'll know the answer.

C. Accepting criticism immediately.

D. Replying back immediately to criticism.

E. If the criticism is true and can help them, they accept it.

F. He may become very unhappy if he gets 99/100 in an exam.

G. He may become very unhappy if he can't pass the exam.

有人将化肥或污染剂大量排放到水体中常会出现水体变绿导致鱼类死亡，进而引起水质变坏发臭的现象，称为水体富营养化。请设计实验探究水体富营养化现象与复合肥(磷酸氢二铵)浓度之间的关系，并进行实验结果的预测。

供选实验材料：裸藻培养液(内含裸藻)、滴管、试管、试管架、记号笔、复合肥(磷酸氢二铵)、自来水、显微镜、载玻片、盖玻片、吸水纸、计数板等。

实验步骤：

第一步：配制N组一系列浓度梯度的复合肥(磷酸氢二铵)溶液。

第二步：____。

第三步：____。

第四步：在____号试管中按浓度梯度分别加入____。在剩余试管中加____。

第五步：____培养一段时间。

第六步：____。

实验结果预测和结论(实验结果可能多种多样，请将下列两种可能的结果及结论补充完整)：

①如果随复合肥(磷酸氢二铵)溶液浓度的不断加大，裸藻数量也明显增多，则说明____；

②如果随复合肥(磷酸氢二铵)溶液浓度的不断加大，裸藻数量无明显变化，则说明____。