What have scientists achieved in dealing with floods?（）

• A、They have prevented many rivers from flooding.

• B、They have reduced the damage caused by floods

• C、They have learned much about conditions for flooding.

• D、They have found most of the ice damson the river.

---Do you like talking with your friends on the phone or through the Internet?

---_______I enjoy writing letters.（）

• A、None

• B、Either

• C、Neither

• D、Both

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