商品品名，即商品名称，是代表某一种商品的（）符号，是不同商品相互区别的标志。
A、文字
B、特征
C、语言
D、性能
参考答案：A
填空。
1. we are _____ at Wang Lin's long yellow hair.
2. After the long walk, the children are very _____.
3. I like dolphins because they're very _____.
4. The boy is _____. He wants to be a basketball player when he
grows up (长大).
当管径或暗渠的净高为800～1000mm时，污水管道检查井的最大间距应为（）m。
A.30
B.50
C.70
D.90
