单项选择题

患者，男，30岁。2年前因胃溃疡做过“胃切除术”，近半年来常头晕、心悸，诊断为缺铁性贫血。其贫血的原因最可能是

A.铁摄入不足
B.铁需要量增加
C.铁吸收不良
D.铁消耗过多
E.铁不能利用

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未分类题

What can dogs see? The answer to this question is disappointing; dogs【C1】______see no colors. The answer is disappointing【C2】______many owners of dogs will naturally be sorry that their dogs cannot see colors which to them are beautiful. But then, they may【C3】______that clogs have an extraordinary【C4】______sense of smell. The dog's world is【C5】______in enjoyable smells,【C6】______it may be colorless.How do we know if dogs are color-blind? This has been tested in the same way【C7】______it has been discovered what dogs can hear. The【C8】______has been made to train dogs to salivate(流口水)when they are shown【C9】______different colors. Such experiments have【C10】______failures; it has been found impossible to make dogs【C11】______colors from one another【C12】______signals for their dinner. This question requires further【C13】______with other techniques, but so far as the available scientific evidence【C14】______, dogs seem to be color-blinD.Monkeys, on the other hand, are able to distinguish colors. They have been trained successfully to【C15】______their meal to a cupboard, the door of【C16】______was painted in a certain color, and to【C17】______other available cupboards with differently colored doors,【C18】______which there was no fooD.【C19】______monkeys and apes,【C20】______, most mammals seem to be color-blinD.Even bulls have been shown not to see red as a color.【C1】A.extremelyB.apparentlyC.consequentlyD.merely

A.B.
C.【C19】______monkeys
D.
【C1】
A.extremely
B.apparently
C.consequently

单项选择题

患者，男，20岁。可疑血友病，下列哪项不作为筛查试验

A.凝血时间
B.活化部分凝血活酶时间
C.凝血酶原消耗
D.简易凝血活酶生成试验
E.纤维蛋白原

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