答案：B
用所给单词的适当形式填空。
1. Winter, spring, summer and fall (be) seasons.
2. What a cold, (snow) day!
3. I'm (take) off my hat now.
4. I have some little rocks for (he) mouth and eyes.
5. Let's (go) home.
6. Snow (fall) now.
用户选用汽油标号的依据是什么？选用汽油标号的具体标准是什么？
