预测事件的变化主要不是受技术、收入等客观因素影响，而是受政策、方针、个人意志等因素影

阅读下面的短文，并根据短文内容填表格。

     What do you think of the most important inventions in the world? The TV? The printing? The

telephone? Or the computer? A report shows that they are not the only important inventions. Here are

three other important inventions.

     One of the simplest inventions is the toilet. Before toilets, waste ran into rivers from people's houses.

Illnesses were common in big cities, and it was often difficult to find clean drinking water.

     Animal food is another important invention. Before the invention, most animals were killed every

autumn because there was not enough food for them in winter. After hay became a kind of common

animal food, animals could live through the long winter.

     The third great invention is glasses. Glasses help people read, write and do "close work" after the age

of forty-five. Without glasses, the world would be difficult for the people above forty-five.

. ______ was done by the girl students.

A．One three of the work

B．One third of the works

C．Two third of the works

D．Two thirds of the work

小明在做“铁钉跟硫酸铜溶液反应前后质量的测定”的实验时，向100 mL烧杯中加入30 mL硫酸铜溶液，将几根铁钉用砂纸打磨干净，将盛有硫酸铜溶液的烧杯和铁钉一起放在托盘天平上称量，记录所称的质量m1。将铁钉浸到硫酸铜溶液中，观察实验现象。待溶液颜色不再改变时，将盛有硫酸铜溶液和铁钉的烧杯放在托盘天平上称量，记录所称的质量m2。比较反应前后的质量，发现天平的读数不变，即m1= m2。通过此实验，你可以观察到哪些现象，以及得到哪些结论？请列出四条来。   

(1)现象：

①_______________________________；   

②_________________________________。

(2)结论：

①_______________________________；

②_________________________________ 。

吐泻转筋，宜选哪种药物（）

A.豨莶草

B.臭梧桐

C.羌活

D.木瓜

E.络石藤

运动功能的检查。