-A ruler is 2 dollars and a pen is 5 dollars. How much are they?
-They are               
A．$22B．$3C．$7D．$5
C

試題分析：句意：--兩美元的一把尺子和五美元的一支鉛筆。他們一共有多少元？--他們是七美元。分析：很簡(jiǎn)單的一道數(shù)學(xué)題兩者相加，2+5=7，故選 C
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