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【简答题】
据报道,美国耶鲁大学的生物学家正在从事将病毒引诱到人体“陷阱细胞”中,以防止病毒繁殖的实验研究。例如,HIV通过T细胞表面的CD4识别T细胞(如图甲),如果给AIDS患者注射大量用CD4分子修饰过的红细胞(如图乙),则该红细胞也会被HIV识别、入侵。但HIV在红细胞中无法完成复制、增殖,最后随红细胞的死亡而被清除,该方法目前已经在小鼠体内获得阶段性成果。 人体成熟的红细胞之所以能成为“陷阱细胞”,从细胞结构角度分析是因为(),不具备HIV增殖的条件。
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举一反三
【单选题】My bicycle needs .
A.
repaired
B.
repairing
C.
repair
D.
to repair
【单选题】Excel2000编辑栏中的“×”表示【】
A.
公式栏中的编辑有效,且接收
B.
公式栏中的编辑无效,不接收
C.
不允许接收数学公式
D.
删除编辑栏的数据
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【简答题】双肢柱由肢杆、____和____组成。
【单选题】be in line for sth.
A.
develop sth. new, esp. a strong relationship with other people, groups or countries
B.
the conditions that affect what happens or how st. reacts in a particular situation
C.
be likely to get sth.
D.
a good and acceptable reason for doing sth.
【单选题】build [sth.] up
A.
increase [sth.] slowly
B.
praise [sth.] highly
C.
strengthen [sth.]
【简答题】We shoulde________ the thought of health first in schools physical education. (build, construct)
【单选题】听力原文:W: Robert, this bicycle would be good for racing and it isn't very expensive. M: Yes, but my daughter needs a lighter bike to use when she goes to school. What does Robert's daughter do?
A.
A painter.
B.
An athlete.
C.
A student.
【单选题】manage to do sth.
A.
try to do sth.
B.
try to do sth. successfully
【单选题】pick out sth.
A.
pay attention to sth.
B.
make small holes in sth.
C.
remove sth.
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