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问题 单项选择题

营养性巨幼红细胞性贫血的确诊依据为（）

A.红细胞体积增大

B.红细胞减少比血红蛋白下降明显

C.血清铁，总铁结合力正常

D.骨髓红细胞巨幼变

E.周围血象中出现有核红细胞

答案

参考答案：D

选择题

下列关于“不一定”的说法中，不正确的是 [ ]

A.含氧化合物不一定是氧化物

B.质子数相等的粒子不一定是同种元素

C.由分子构成的纯净物不一定只含一种分子

D.由同种元素组成的物质不一定是单质

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填空题
用所给单词和短语的适当形式完成下列句子。
convince,   Switzerland,   direct,   bore,   wear,   pick out,
badly off,   perform,   astonish,   cut off,   fortunate
1. You mustn't laugh at ____ people.
2. No one has come up with a ____ explanation of why dinosaurs died out.
3. ____ is famous for its milk and cheese.
4. Because of the earthquake, all the supplies of electricity and water have ____.
5. The car rushed at the bridge at ____ speed.
6. I feel very ____ and lonely.
7. The best ____ goes to them.
8. Driving with ____ tread(s) (轮胎) can be dangerous.
9. How could you ____ your own motorbike in a sea of motorbikes?
10. We are now living in a very bad condition but someone is even ____.
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