Everybody knows vegetables and fruit are g____for people．Many people eat some fruit each day．Mr and Mrs Smith like e____ fruit very much and every day Mrs Smith goes to buy some fruit in the shop near her home. She can buy all k____ of fruits there，such as apples，pears, oranges and bananas．In different time of the year the p____ of each kind of fruit is not the same，s____  high，sometimes low. Mrs Smith usually t____  to buy cheap fruit．And b____  are Mr Smith’s favourite fruit．Mrs Smith buys bananas for him every week．But she always chooses the cheap ones.“Eating fruit can help to keep f____ ，" said Mr Smith．“It's quite d ____ from snacks．Both of them can give us energy．But snacks l____ cakes, chocolates and sweets are not good for our health at all," 

下列有关我国西北地区的描述，正确的是（　　）

如图是鱼的头部结构图，请仔细观察并回答下面的问题：