– What’s this? It is .A. an UFOB. a orangeC. rulerD. an ID card

问题补充：

– What’s this? -- It is .

A. an UFO

B. a orange

C. ruler

D. an ID card

答案：

A. an UFO

B. a orange

C. ruler

(答案→)D. an ID card

解析：句意：这是什么？这是一张身份证。A、B、C分别改为：a UFO, an orange, a ruler。所以选D。