What’s the reason for twins to be at a disadvantage in their intellectual development?

• A、They can only understand their own private language

• B、They communicate with outsiders less than non-twins.

• C、There is little stimulation for them.

• D、Adults don’t like to talk with them.

58（）

The second largest stock exchange in the U.S. used to be called .

• A、the Wall Street Exchange

• B、the New York Stock Exchange

• C、the Curb Exchange

• D、the U.S. Exchange