题目

用所给动词的正确形式填空 80. You had better get a doctor ______________ (pull out) your bad tooth. 81. It is the first time that he ____________(meet) the singer . 82. On the wall __________(hang) two beautiful pictures . 83. The school life he was used to _________(change) a lot since ten years ago . 84. The trees were cut down and that resulted in the city ___________(bury) by sand . 85. The old man urged that all the food ___________(buy) the next day . 86. The signs ______________ (indicate) the directions have been put up. 87. The experiment is being carried out, a（1）如图1所示，体温计的读数为______℃．（2）小王同学在做“探究水的沸腾”实验时，对水加热了很长时间后水才达到90℃以上，发现问题并改进后继续加热至沸腾．他记录的数据如下表所示： 时间/min … 0 1 2 3 4 5 6 7 8 9 水温/℃ … 91 92 93 94 95 96 97 97 97 97①从数据上看，本次实验中水沸腾时的温度为______℃；②请你根据记录数据，在图2的坐标中画出水的温度和时间关系的曲线；③实验中发现水从开始加热到达到90℃的这段时间过长，造成这种现象的原因可能是：______．（给出一种原因即可）