题目

学生在“研究水的沸腾”的实验中，根据实验数据，画出下图所示图线。由图可知：水加热的初温度是℃，加热分钟后，水开始沸腾；段图线反映了水沸腾的过程，在此过程中水的温度（填上升、下降、不变）。实验中水的沸点是。 答案：【1】90【2】4【3】BC【4】不变【5】99℃V. 短文改错        In order to make best of learning materials,the Students’ Union of our school is planning an activity. The school-leavers are called on to give away our used books,newspapers or magazines to the student in the lower grades. The idea,that is intended to promote friendship and encourage a low-carbon lifestyle,are highly praised and supported by the teachers and students alike. The activity will be hold on the first floor of the school library and so it will last eleven days,from June 10 to 20. As a student,I am strong for the activity because it is very meaningful and helpful. I hope that this kind of activity would continue every year for the future.