煎猪扒主要是利用（）的传热方式使猪扒致熟
A.传导
B.对流
C.辐射
D.导热
参考答案：A
下列选项属于商品的是( )
①未经开采的矿泉水 ②人们为救灾捐献的棉衣 ③药店里的各种药品
④农民以保护价卖给国家的粮食 ⑤小张送给小丽的一支钢笔 ⑥收购的废品
A．③④⑤
B．③④⑥
C．②④⑤
D．④⑤⑥
The United States ______ 52 states while China ______32 provinces and autonomous regions. [ ]
A. forms of; consists of
B. consists of; is made up of
C. is made up; consists of
D. is formed; is made up of
