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【简答题】
阅读理解. My aunt Edith was a widow (寡妇) of 50, working as a secretary, when doctors discovered what was thought to be a very serious heart disease. Aunt Edith doesn't accept defeat (击败) easily. She began studying medical reports in the library and found an article in a magazine about a well-known heart surgeon (外科医生), Dr. Michael DeBakey, of Houston, Texas. He had saved the life of someone with the same disease. The article said Dr. DeBakey's fees were very high; Aunt Edith couldn't possibly pay them. But could he tell her of someone whose fee she could pay? So Aunt Edith wrote to him. She simply listed her reasons for wanting to live: her three children, who would be on their own in three or four more years, her little girl was dreaming of traveling and seeing the world. There wasn't a word of self-pity---only warmth and humor and the joy of living. She mailed the letter, not really expecting an answer. A few days later, my doorbell rang. Aunt Edith didn't wait to come in; she stood in the hall and read aloud: 'Your beautiful letter moved me very deeply. If you can come to Houston, there will be no charge for either the hospital or the operation. Signed-Michael DeBakey.' That was seven years ago. Since then, Aunt Edith has been around the world. Her three children are happily married. For her age, she is one of the youngest, most alive people I know—all because of an open heart surgeon who knew how to honor his profession, and how to open his own heart. 1. We learn from the reading that ________. A. the heart disease was hard to deal with at that time B. some doctors also could save Aunt Edith's life C. Aunt Edith's children worried about their mother D. Aunt Edith finally died when she was 57 2. The underlined word charge is the closest in meaning to ________. A. problem B. fee C. time D. chance 3. Aunt Edith didn't really expect an answer because ________. A. she didn't know Dr. DeBakey's exact address B. Dr. DeBakey was too busy to write a letter C. she didn't tell the doctor her trouble D. she thought the doctor didn't care about the poor 4. Dr. DeBakey promised to help Aunt Edith in order to ________. A. make himself better-known B. make her dream come true C. honor his profession D. help the children live better 5. Which is the best title of the passage? A. A Lucky Widow B. A Successful Operation C. An Unexpected Answer D. A Full-loved Letter
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【单选题】关于冈崎片段的叙述正确的是:
A.
两条子链上均有冈崎片段
B.
原核生物的冈崎片段长于真核生物
C.
冈崎片段的生成不需要RNA引物
D.
冈崎片段是由DNA聚合酶I催化生成的
E.
滚环复制中不出现冈崎片段
【单选题】关于冈崎片段的以下叙述,正确的是
A.
一个复制叉中的两条链,都要先合成冈崎片段然后再连接起来
B.
一条新链上,只有第一个冈崎片段需要引物引发,之后的冈崎片段不需要引物
C.
真核生物的冈崎片段比原核生物更长
D.
冈崎片段的产生是由于复制叉中两条链的方向相反,但新链只能沿一个方向进行延伸
【单选题】He gave us a nod and muttered a “yes” after _______ seemed like hours.
A.
that
B.
which
C.
it
D.
What
【单选题】下列关于冈崎片段的叙述正确的是()
A.
由DNA聚合酶Ⅰ催化合成
B.
合成的方向与复制叉移动的方向相同
C.
合成的方向为3’-5’
D.
合成的方向为5’-3’
【单选题】He muttered a _______ under his breath.
A.
curse
B.
incident
C.
goodie
D.
whereabouts
【多选题】下列关于原核生物的冈崎片段的叙述,正确的是?
A.
是由DNA聚合酶Ⅲ催化合成的
B.
合成方向是3'→5'
C.
其合成的方向与复制叉移动的方向相反
D.
其合成的方向是5'→3'
【单选题】When he learned that he had no choice but _____, Jack muttered under his breath, “I hate this stupid road.” prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
to drive
B.
drive
C.
driving
D.
drives
【简答题】均匀磁场中,三角形、矩形和圆形三个平面线圈,面积相等且通有相同的电流,线圈的磁矩是否相等?所受的最大磁力矩是否相等?磁场力之和是否相等?
【单选题】When he learned that he had no choice but ________, Jack muttered under his breath, “I hate this stupid road.”
A.
to drive
B.
drive
C.
driving
D.
drives
【多选题】关于冈崎片段的叙述,正确的是
A.
前导链没有形成冈崎片段
B.
由于复制中有缠绕打结而生成
C.
因为有 RNA 引物,就有冈崎片段
D.
由于复制与解链方向相反,在随后链生成
E.
复制完成后,冈崎片段被水解
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