在招标过程中，标底的公布应在( )阶段进行。
A．准备招标文件 B．接受投标书 C．开标 D．评标
参考答案：C
Ten years have passed and I’m glad to find that the local villagers are now much______ than they were before.
A．well off
B．better off
C．badly off
D．worse off
简述氧化淀粉的特点及用途。
