题目

地球的公转产生的地理现象是     （   ）                                 A.昼夜交替现象                       B.时间的差异 C.四季的变化                         D.日月星辰的东升西落 答案：CMr Smith _______ send his robot back to the shop because it isn't working.A.needB.needsC.needs toD.need to