全等图形的形状和大小都相同.[ ]
正确
Mr Green has a _______ son named David. [ ]
A. five years old
B. five-year-old
C. five-years-old
不属于优质蛋白的食物是()
A．玉米
B．牛肉
C．豆类
D．牛奶
E．大米
