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

问题补充：

-A ruler is 2 dollars and a pen is 5 dollars. How much are they?

-They are

A. $22

B. $3

C. $7

D. $5

答案：

A. $22

B. $3

(答案→)C. $7

D. $5

解析：句意：--两美元的一把尺子和五美元的一支铅笔。他们一共有多少元？--他们是七美元。分析：很简单的一道数学题两者相加，2+5=7，故选 C