Street vendors are not always reliable because______.A．they sell illegal goodsB．they are n

A．They only like themselves.B．They can always make a difference.C．They are not bothere

These creatures are so tiny that they can not always be seen with the ______ eye.A．bareB．n

Why are organic vegetables not always safe？A．Because they contain more chemicals.B．Because

The re－examination results indicate that one－third of the goods are not（) standard.

Old people are always saying that the young are not what they were. The same comment is ma

His friends are not happy with him because he always turns down their invitations ( )