【单选题】It is said that he has and will arrive home in a few hours.
【单选题】He ___ to break the record for the long-distance race.
【单选题】. Busy as he is, he ________ a few hours a week for physical exercise.
【判断题】在园林中,道路的面积占总面积的8%~12%。()
【单选题】We will set off after he finishes packing.
【简答题】把折射率为1.5的玻璃片插入杨氏实验的一束光路中,光屏上原来第五级亮条纹所在的位置变为中央亮条纹,光波长为500nm,则插入的玻璃片厚度为 um。(保留一位小数)
【单选题】Each week he tried to _____________ a few dollars for an overseas trip.
【单选题】He ______ his new job with confidence.
【单选题】He set down a few proposals.