______ he is still young, he is going very grey.
As long as
B. As
C. While
D. Even
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The United States Constitution provides for a count of the population ______ a census, every ten years.
A. called
B. which called
C. that it is called
D. as called
输入受限的双端队列是指元素只能从队列的一端输入，但可从队列的两端输出。若有8，1，4，2依次进入输入受限的双端队列，则得不到的输出序列是______。
A. 2814
B. 1482
C. 4218
D. 2148
应用铁剂治疗缺铁性贫血时，下列说法错误的是
A. 口服1周，血中网织红细胞即可上升
B. 2～4周后，血红蛋白明显增加
C. 血红蛋白达正常值需1～3个月
D. 血红蛋白正常后，应继续服用2～3个月
E. 三价铁吸收率高于二价铁吸收率
沙丁胺醇剂量过大引起手指震颤的原因是
A. 激动骨骼肌N2受体
B. 激动骨骼肌β2受体
C. 激动中枢胆碱受体
D. 阻断骨骼肌β2受体
E. 阻断中枢多巴胺受体
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