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【单选题】A．CD2、CD3、CD4、CD7、CD8B．CDl0、CDl9、CD20C．CDl6、CD56D．CDl3、CDl4、CDl5、CD33E．TdT、CD33、CD34 T细胞及其肿瘤的免疫标记特征是：
A.
A．
B.
B．
C.
C．
D.
D．
E.
E．
【单选题】An elm in our backyard（7）the blight (枯萎病) this summer and dropped stone dead, leafless, almost overnight. One weekend（8）was a normal-looking elm, maybe a little bare in spots but（9）alarming, and the n...
A.
There are so many new books about dying that there are now special shelves set aside for them in bookshops, along with the health-diet and home-repair paperbacks. Some of them are so（1） with detailed information and step-by-step instructions for performing the function, that you’d think this was a new sort of（2）which all of us are now required to learn. The strongest impression the casual reader gets is that proper dying has become an extraordinary,（3）an exotic experience, something only the specially trained can do.
B.
（4）, you could be led to believe that we are the only（5）capable of being aware of death, and that when the rest of nature is experiencing the life cycle and dying, one generation after（6）, it is a different kind of process, done automatically and trivially, or more "natural", as we say.