问题
选择题
测定空气中氧气含量的实验中正确的操作步骤如下：①加热玻璃管；②缓慢推动两个注射器；③装入细铜丝团并连接两注射器；④冷却至室温，读出注射器内气体体积；⑤停止加热；⑥将一注射器内气体全部推至另一注射器中．其中正确的顺利是（ ）
A．③①②⑤⑥④
B．①②④⑤⑥③
C．③①⑤④⑥②
D．①③④②⑥⑤
答案
答案：A
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测定空气中氧气含量的实验中正确的操作步骤如下：①加热玻璃管；②缓慢推动两个注射器；③装入细铜丝团并连接两注射器；④冷却至室温，读出注射器内气体体积；⑤停止加热；⑥将一注射器内气体全部推至另一注射器中．其中正确的顺利是（ ）
A．③①②⑤⑥④
B．①②④⑤⑥③
C．③①⑤④⑥②
D．①③④②⑥⑤
答案：A
When Roy was four years old, his father ___1____ in an accident, leaving his mother and him. After Roy left high school, he wanted __2_____ to a good college(大学) in his hometown. But his mother would pay ___3___ money for his college education. I’ll try to do something for you as soon as you pass the entrance exam (入学考试),” said his mother. Roy took the exam. As a result, he could enter the college ___4___ he didn’t get high scores. His mother was very excited, but she knew quite a lot of money would be needed. The next day, she sold her car and asked her boss ____5__ another four hours’ work every day. She even had two jobs, one during the day and ___6___ at night. She had to walk to work and work for twelve hours a day, seven days a week, but she didn’t ___7_____. She thought her son’s education was worth (值得) so much. A term passed. Roy took his first exam after entering the college. When the results were told, Roy ran home to _8___ his mother the news. “Mum”, he said , “I’ve got my exam results. You must be very ___9____.” “ You mean you’ve passed?” She asked happily. “No. I haven’t. You can get your car back and stop ___10____ like that from now on.”
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