They wrote a letter of thanks to ________ had helped them.
A. who
B. whom
C. whomever
D. whoever
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血小板在止血中的功能，下列哪项是错误的（）
A. 活化 FⅫ，启动内源凝血途径
B. 黏附功能
C. 聚集功能
D. 释放功能
E. 血块收缩功能
The newspaper will have to close down if it cannot increase its ________ considerably.
A. distribution
B. contribution
C. prescription
D. circulation
Traditional linguists believe that the written form of language is ______to the spoken form.
A. senior
B. junior
C. inferior
D. superior
急淋与急非淋白血病分类主要根据（）
A. 白血病细胞的数量
B. 白血病细胞的类型
C. 白血病细胞的分化程度
D. 白血细胞浸润的部位
E. 白血病裂孔现象
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