以下哪项不是煮及第粥的材料?()
A、猪肝
B、猪瘦肉
C、猪粉肠
D、猪皮
参考答案:D
My sister isn’t in. ________ she comes back, I’ll let her call you back.
A.While
B.Until
C.Before
D.When
幼儿科学教育应让幼儿掌握哪些方法技能?