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--Now the air in our hometown is even _______ than it was before．

--So we must do something to stop it．

A．dirty               B．better              C．worse             D．more better

---Now the air in our hometown is even       than it was before.

---So we must do something to stop it.

---Now the air in our hometown is even       than it was before.
---So we must do something to stop it.

[　　]

(2006·黃岡市)

--- Now the air in our hometown is even ________ than it was before.

--- So we must do something to stop it.

[　　]