单项选择题

______ the surface of metal, but also weakens it.

A．Not only does rust corrode
B．Not only rust corrodes
C．Rust not only corrodes
D．Rust, which not only corrodes

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单项选择题

This article suggests that if one wants to be successful he should have()

A．luck
B．abilities
C．hard work
D．both B and C

单项选择题

The author ()

A．believe that most people are superstitious
B．believe that very few people are superstitious
C．believes that there are still some evidences of superstitions in what we say and what we do
D．is superstitious