问题 选择题

近年来全国各地发展了“农作物--猪--沼气--茶”等生态农业模式,猪粪及秸秆经发酵产生沼气和渣水.沼气可以燃烧,渣水可为茶林及农作物施肥.将猪粪发酵成沼气和渣水的微生物种类和该微生物在生态系统中的地位分别是(  )

A.甲烷菌、生产者

B.乳酸菌、消费者

C.甲烷菌、分解者

D.酵母菌、分解者

答案

我国在新农村建设中,为了改善农村卫生条件,改变能源结构,减少环境污染,大力推广兴建沼气池,把人粪尿、禽畜粪尿和秸秆放在沼气池中,其中的很多有机物,可以被细菌利用,在无氧的环境中,一些杆菌和甲烷菌等细菌通过发酵把这些物质分解,产生甲烷,可以燃烧,用于照明、取暖等,是一种清洁的能源.还可以利用呼吸作用释放能量形成的高温杀死人粪尿中的各种病菌和虫卵,从而达到无害的目的.分解者包括细菌和真菌,能将动植物遗体、遗物分解产生二氧化碳、水和无机盐等,因此,将猪粪及秸秆发酵成沼气和渣水的微生物主要是腐生的细菌(或甲烷细菌或细菌和真菌),它在该生态系统中属于分解者.

故选:C.

单项选择题
单项选择题

All her life, my mother wanted busy children. It was very important that her house should remain at all times clean and tidy.
You could turn your back for a moment in my mother’s house, leave a half written letter on the dining table, a magazine open on the chair, and turn around to find that my mother had "put it back where it belonged," as she explained. My wife, on one of her first visits to my mother’s house, placed a packet of biscuits on an end table and went to the kitchen to fetch a drink. When she returned, she found the packet had been removed. Confused, she set down her drink and went back to the kitchen for more biscuits, only to return to find that her drink had disappeared. Up to then she had guessed that everyone in my family held onto their drinks so as not to make water rings on the end tables. Now she knows better.
These disappearances had a confusing effect on our family. We were all inclined to forgetfulness, and it was common for one of us, upon returning from the bathroom, to find the every sign of his work in progress had disappeared suddenly. "Do you remember what I was doing" was a question frequently asked, but rarely answered.
Now my sister has developed a secondhand love of clean windows, and my brother does the cleaning in his house, perhaps to avoid having to be the one to lift his feet. I try not to think about it too much, but I have at this later time started to dust the furniture once a week.

The underlined part in the fourth paragraph suggests that my sister ______.

A.is happy to clean windows
B.loves to clean used windows
C.is fond of cleaning used windows
D.likes to clean windows as my mother did