问题
单项选择题
逆转录病毒载体系统的缺点是：
A．感染细胞量大
B．稳定性较好
C．病毒滴度较高
D．只能整合至分裂相的细胞
E．转染谱广
答案
参考答案：D
解析：[解题思路] 逆转录病毒载体系统的特点。逆转录病毒载体系统的特点包括转染谱广、感染细胞量大、稳定性较好、病毒滴度较高，D选项与E选项矛盾，故E选项是正确答案。
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逆转录病毒载体系统的缺点是：
A．感染细胞量大
B．稳定性较好
C．病毒滴度较高
D．只能整合至分裂相的细胞
E．转染谱广
参考答案：D
解析：[解题思路] 逆转录病毒载体系统的特点。逆转录病毒载体系统的特点包括转染谱广、感染细胞量大、稳定性较好、病毒滴度较高，D选项与E选项矛盾，故E选项是正确答案。
(2013·东北三省四市联合诊断考试)I had a bad habit of skipping to the last pages of a book.I just wanted to see how it ended ____ I was still in the middle of it. This habit ____ first my mom，then my friends, and ____ even my own daughter. Often my ____ wouldn't be limited just to the books I read but also to what others were ____ as well.Then one day my daughter told me in anger, “Dad, please just read a book one ___ at a time like everyone else！” At times I didn't ___ this bad habit to just books either.I also tried to skip ahead in my own life and ____ out what to do months and even years from now ____ enjoying each day at present. Although I knew that the ____ of my life wasn't done yet and that I had many pages ___ to go, I still couldn't control my burning desire to write the ____ of it halfway through.Time and again, I would ____ jump ahead and try to solve every potential problem before it happened. Life，____，doesn't work like that.It loves to ____ us，and you never know what new problems, changes, or opportunities each new day will ____. Recently when I found myself living in the ____ again，I felt a voice that gently told me I needed to “live one day at a time”. When I heard those words, I ____，turned the book of my life back to the ____ page, and thanked God for today. Each of us has to ____ the book of life line by line，moment by moment and trust that our story will be brought to its perfect end.
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