维生素D缺乏性手足抽搐症多见于()
A.6个月以内小婴儿
B.2岁以上幼儿
C.新生儿
D.1岁以上小儿
E.以上都不是
参考答案：A
用所给词的适当形式填空。
1. This was his _____ (two) time to cook.
2. It's hard for me_____ (drive)a car.
3. Mark is a _____ (Russia) and he lives in Russia all his life.
4. She doesn't have any _____ (hobby). But she likes studying very much.
5. I hear some _____ (foreign) will visit our school next week.
发现磁共振物理现象，并获得诺贝尔物理奖的是（）
A.Block和Lauterbur
B.Damadian和Block
C.Mansfield和Purcell
D.Block和Purcell
E.Damadian和Lauterbur
