这句名言的。

　　9．What can we learn about Chris Ulmer?

　　A．He praises his students one by one.

　　B．He is Syona's favorite teacher.

　　C．He use videos to teach his students.

　　D．He asks his students to help each other.

　　解析：选A　细节理解题。根据文章第二段第一句话可知选项A正确。

　　10．Syona felt very pleased because________.

　　A．she has developed a cool attitude

　　B．her progress was appreciated by her parents

　　C．her mother knew what she expressed

　　D．she had been to Ecuador with her classmate

　　解析：选C　细节理解题。根据文章倒数第三段"She recently told me about her classmate's trip to Ecuador and was very proud when I understood her on the first try."可知选项C正确。

　　11．What change has taken place in the author's family?

　　A．They invite Ulmer's students to their home.

　　B．They visit Ulmer's classroom regularly.

　　C．They feel grateful to people in their lives.

　　D．They give each other praise every day.

　　解析：选D　细节理解题。根据文章倒数第二段"We've recently started our day by reminding each other of the good qualities we all possess."可知选项D正确。

　　D

　　(2018·湖北省鄂西北联考)It happens to most first­time fish keepers. They run to a fish store, pick out the best­looking fish, and get all the things they need for their tanks. Then they fill up their tanks and put their fish in the water. Over the course of the next week, their fish aren't looking so good. Then all of a sudden, all of their fish start to die off.

　　Luckily, there is an explanation. Ammonia (氨) and nitrite (亚硝酸盐) are toxic to fish. You see, keeping fish in a tank produces ammonia. If a fish is placed in a new tank, the tank won't be equipped with the ability to change that ammonia into a less harmful chemical. And that's why they die.

To avoid the whole failure, you have to understand a little something called the Nitrogen