涤棉纱上浆时可以采用（）。
A、纯PVA浆
B、以PVA为主的混合浆或纯PVA浆
C、以淀粉为主的混合浆
D、以PVA为主的混合浆
参考答案：B
根据句意用括号中所给单词的适当形式填空。
1. I'd like a pair of _____, please (shoe).
2. They talked on and on very _____ (happy).
3. The _____ are building a tall building. (work)
4. This bag isn't Lucy's , It's _____ sister's. (she)
5. The first lesson is the _____ of all. (easy).
2011年，国家宏观调控的首要任务，也是最为紧迫的任务是毫不放松地抓好农业和粮食生产。（）
