21．People at California’s Glace Luxury Ice Company probably want consumers to believe that _____.

　　A. ice cubes are healthy for people to use

　　B. their ice cubes add tastes to drinks

　　C. all ice cubes are created the same

　　D. their ice cubes are different

　　22．What does the underlined word “hazardous” in paragraph 2 mean?

　　A. Active

　　B. Regular

　　C. Dangerous

　　D .Powerful

　　B

　　Mr. Sankaram, a physics teacher, was known for his antics(滑稽动作)in his classroom to make the dull lessons in physics lively and interesting. Mixing different chemical drugs in the lab to become new substances in chemistry makes students excited. While studying botany or zoology, students can visit a garden or zoo. But physics limits students to listening to the boring lectures which are hard to understand. For example,

　　why an apple dropping from a tree travels downwards but not upwards. But Mr. Sankaram’s classroom antics to cause students to listen to topics such as how sound travels in air or why light travels faster than sound made him stand out from the rest of the teachers.

　　At that time, most students in our school attended the college to please their parents, and some parents were proud of their children for simply attending a college, no-matter whether they benefited or not. They didn’t study hard. But a few students were diligent and they wanted to study pre-medical courses to gain admission into the medical school. The schooling of pre-medical courses was very expensive. The college was next to the medical school. The wall separating them was about four feet high. Few tried to jump over the wall to get free pre-medical courses. Doing this was at risk of injuries and the climbing was forbidden.

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