题目

–---I wonder __________.   –--Zebras.A．what do they call these animalsB．how they call these animalsC．what they call these animalsD．how do they call these animals 答案：C解析:略化简计算①π0+2﹣1﹣﹣|1﹣|②﹣2 ③﹣（+2）④3﹣9+3 ⑤÷﹣×+．