第二节：语法填空

In many countries, ___31___ is not unusual for families of different backgrounds to live together in the shared space. ___32___, in the United States, this idea may still be considered odd.

But this type of housing, ___33___(call) co-housing, is gaining ___34___ (popular) in the United States, too. Co-housing complexes are popping up across the country. For many people, this way of life is a relief to the busy modern lifestyle. A co-housing community has ___35___ (private) owned houses and shared land. There is often a “common house” with a kitchen and dining room, meeting room, and maybe a workshop of library or music room. About 25 co-housing communities ___36___ (build) in recent years, and 150 more are planned.

A co-housing complex is a place ___37___ residents shop, cook, and eat together. Residents of a co-housing complex like its sense of shared community. Children have other kids to play ___38___, ___39___ many families like. Other residents like the feeling of living in a “ village”. Residents also say that they can live in co-housing for ___40 ___ money than they would pay for nearby apartments.

17．(1)渗透　 (2)渗透系统所处的不同温度环境　 漏斗液面高度的变化　 (3)①若1组漏斗液面高度比2组高，则说明低温会影响物质的跨膜运输且运输速率减慢　 ②若2组漏斗的液面高度比1组高，则说明低温会影响物质的跨膜运输且运输速度加快　 ③若1、2组漏斗的液面高度相同，则说明低温并不影响物质跨膜运输　 (4)①低温会影响细胞膜的流动性，从而影响其功能　 ②低温会影响酶的活性，从而影响呼吸作用释放能量的过程

具膜的细胞器，易获得较纯的细胞膜　

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