—A ruler is 2 dollars and a pen is 3 dollars. How much are they?
—They are ________.
| A．$2 | B．$3 | C．$4 | D．$5 |
—A ruler is 2 dollars and a pen is 3 dollars. How much are they?
—They are ________.
| A．$2 | B．$3 | C．$4 | D．$5 |
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