在Windows中，若系统长时间不响应用户的要求，为了结束该任务，应使用的组合键是（）。
A. Shift+Esc+Tab
B. Ctrl+AIt+Del
C. Alt+Shift+Enter
D. Ctrl+Shift+Enter
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Which of the following statements is NOT true according to the fourth and fifth paragraphs？
A. Our biological clock resets itself automatically．
B. 1ight gets through our eyes and resets our biological clock．
C. Our internal clock as well as the alarm clock can be reset automatically．
D. Our internal clock，like the alarm clock，can be reset．
Over one quarter of energy consumption for lighting could be saved by 2025 if___________．
When her generosity was made__________．
A. people donated billions
B. hundreds of students got scholarships
C. hundreds of people put money into the fund
D. she was sent to university
请在第____处填上正确答案。
A. There have been many attempts to redesign the periodic table since Dmitri Mendeleev drew it up in 1871．
B. Railsback has still ordered the elements according to the number of protons they have．
C. “I imagine this would be good for undergraduates．”
D. Railsback has listed some elements more than once．
E. And the size of element’s symbol reflects how much of it is found in the Earth’s crust．
F. The traditional periodic table was well drawn．
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