问题
选择题
下列物质的用途由化学性质决定的是( )
A.用氦气填充气球
B.干冰可作致冷剂
C.氢氧化钙用于抹墙
D.浓硫酸用作干燥剂
答案
答案:C
下列物质的用途由化学性质决定的是( )
A.用氦气填充气球
B.干冰可作致冷剂
C.氢氧化钙用于抹墙
D.浓硫酸用作干燥剂
答案:C
从方框中选择适当的单词填空。 | |
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1. He finds the movie _______. 2. Your answer is right, but l want a more _______ answer. 3. Some people think grammar isn't important but I feel _______. 4. If I meet a foreigner, I will __ English with him. 5. I think reading English books and _______ is good. |