【单选题】I don’t think it is difficult for a senior student to ________ the difference between “hurt” and “injure”.
【简答题】Who is a senior student? ______.
【简答题】简述 水体沉积物中重金属的释放的影响因素
【单选题】During the day I can’t work .
【单选题】— What about having a picnic in the open air during the coming May Day Holiday? — I simply can’t wait!
【简答题】What can the day center do for the old? To keep them from ______during day time.
【单选题】______abroad for a tour can be a worthwhile experience to a senior high student.