单项选择。
Tom's mother is making a big cake. [ ]
A. his
B. their
C. him
D. hers
答案:C
NaOH的俗名为()
A.长度相同
B.玻璃泡大小相同
C.分度值相同
D.能够测量的最高温度和最低温度分别相同