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

.Many people don’t know that_____.

• A、twins understand each other very well

• B、twins are slow to learn to talk

• C、twins are unlikely to do less well at school than other children

• D、there exists more communication between twins

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