一般ξ电位在哪个范围，混悬剂呈反絮凝状态（） A.30～40mV B.40～50mV

任务型阅读（共10空, 每空1分，满分10分）(每空一词)
What do you think is the most important invention in the world? The TV? The printer? 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, people poured or dumped waste 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(干草) 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 45. Without glasses, the word would be difficult for the people above 45.

小题1:
Some most    小题2:   inventions	Three   小题3:   simple inventions	Before the inventions
The TV The printer The     小题4:     The computer	The toilet	Waste     小题5: into rivers from people’s houses. Illnesses were common. It wasn’t often    小题6:  to find clean drinking water.
	Hay/Animal food	People. 小题7:   most animals in autumn because there was not much food in winter.
	小题8:	Reading,    小题9:   and doing “close work” would be difficult for the people who are    小题10:  than 45.