下列对矫形力的描述，错误的是:() A．作用力范围大，力量强 B． 主要作用在颅骨、 发布时间：2017-01-28 00:14 │ 来源：www.tikuol.com 题型：单项选择题 问题： 下列对矫形力的描述，错误的是:()A．作用力范围大，力量强B． 主要作用在颅骨、颌骨上C．主要表现牙和牙弓的改变D．对颜面形态改变作用大
题型：单项选择题 完形填空 Vitamins(维生素) are a discovery of the 20th century. A hundred years 1 , no one knew anything 2 them. The vitamins are 3 by letters of alphabet. Vitamin A 4 by the eyes. Thereis vitamin A in milk, butter and green vegetables It 5 by the body. Vitanun B must be supplied (提供) 6 by some of our food. The skins 7 grains of all sorts have vitamin B in them. Vitamin C is very important 8_ the body. Without it 9 teeth will become loose and their arms and legs become weak. Oranges and tomatoes 10 vitamin C in them. There are other vitamins. But these A, B,C are the most important.( )1. A. before ( )2. A. about ( )3. A. naming ( )4. A. needs ( )5. A. stores ( )6. A. times ( )7. A. of ( )8. A. in ( )9. A. people ( )10.A. has B. front B. of B. named B. need B. be stored B. in not time B. to B. at B. peoples' B. have C. ago C. in C. is named C. is needed C. can store C. all the time C. on C. with C. people's C. there is D. ahead D. for D. names D. was needed D. can be stored D. any times D. in D. to D. peoples D. there are 查看答案