《天上的街市》的作者是____,原名郭开贞,诗人、学者。代表诗集《____》《星空》等。
The chief engineer of the high-speed railway ________ Shanghai to Beijing always devotes most of his time ________ his work.
如图所示的是春季某地一天气温随时间变化的图象,根据图象判断,在这天中,最高温度与最低温度的差是____℃.