老年人的食物中应有足够的蛋白质，特别是（）的营养成份。
参考答案：优质蛋白
The ad says the Shampoo is in good quality. But in fact, it doesn't ______ after I have used it. [ ]
A. run
B. be well
C. work
D. fit
小麦单倍体育种中，影响花药培养功效的因素主要有哪些。
