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[单选题]
Bad habits, _______ formed, are difficult, and sometimes impossible to shake off.(1分)
A
before
B
once
C
until
D
unless
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试题答案：
B
答案解释：
解题思路： 句意：坏习惯一旦形成，很难有时是不可能去掉的了。Before……以前；once一旦；until直到……才；unless除非。这里once后跟从句，从句是省略句，完整的是once they are formed，根据句意故选B。
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In the 17th century, people believed that the earth was flat and ship would fall off the ______.(1分)
1. Strange thing happens to time when you travel. Because the earth is divided into twenty-four time zones one hour apart, you can have days with more or fewer than twenty-four hours, and weeks with more or fewer than seven days.If you make a five-day trip across the Atlantic Ocean, your ship enters a different time zone every day. As you enter each zone, the time changes the hour. Travelling west, you set your clock back; travelling east, you set it ahead. Each day of your trip has either twenty-five or twenty-three hours.If you travel by ship across the Pacific you cross the international date line. By agreement, this is the point where a new day begins. When you cross the line, you change your calendar the full day, backward or forward. Travelling east, today becomes yesterday; travelling west, it is tomorrow! 21. The best title for this selection is____.A. A Trip Across the Atlantic B. How Time Changes Around the World C. Crossing the International Date Line D. How Time Zones Were Set Up
I cannot help but _______ a person who is reluctant to complain about his problems.(1分)
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2. Although breast cancer is one of the most funded areas of cancer research, it is also one of the most confusing. It benefits from very high charitable donations, but suffers from overlapping research, over underfunding of programs, uneven disbursement (支出款项) duplicate research funded programs that do not interact or interface.Approximately one third of all monies allocated by the National Cancer Institute (NCI) for research go to breast cancer, with $631 billion dollars allocated in 2010 alone. The American Cancer Society commits close to 40 percent of its budget on breast cancer, $391 million dollars between 1992 2010, Avon Breast Cancer Crusade has donated $700 million the Susan Komen for the Cure has donated $420 million.Many other programs also provide funding, raising the annual breast cancer budget to about one billion dollars annually. Despite this huge investment, however, 59,000 women will die from breast cancer in North America alone this year.Research so far has failed to understwhat causes the five or six different types of breast cancer. They know about the BRCA 1 BRCA 2 genes, but otherwise lack information on the causes. Many breast cancer programs emphasize education. The Susan Komen Crusade, for example, allocates only five percent of its total budget on treatment, while 43 percent goes to education.If the cause of breast cancer is unknown, what is the purpose of education other than trumpeting mammograms as a means of early detection?
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10. (A)try (B)tried (C)trying (D)to try
22.In the United States, the traditional school year is September to June. Summer school used to be seen mainly as a place for high school students to repeat classes they failed. But summer programs have expanded. Students often go to summer school so they can ease their class load during the school year. Or, it might give them more freedom to choose the classes they want during the regular term.Summer school students do the same amount of work as if they took the class during the school year. But they do it in a much shorter time—just one to two months. They generally attend school for three to four hours every morning, five days a week. Another choice for many students is to take classes online. Students work by computer at home or wherever they have an Internet connection. They could even be traveling with their families. However, some online classes require students to come to a classroom to take tests. Students may also have to take part in group discussions with the teacher online. And there may be a required number of hours to spend logged on each day. Yet there may also be freedom to do the work anytime, day or night.(10分)22.1 A student in the United States doesn’t need to attend school in ______.(2分)A. MarchB. AugustC. DecemberD. February
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