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简述片岩与片麻岩的区别

答案

参考答案：片岩主要由片状或柱状矿物和粒状矿物组成，其中片状或柱状矿物至少〉30％，粒状矿物中常以石英为主，长石含量＜25％。岩石表现为显晶质的均粒鳞片变晶结构或斑状变晶结构，具片状构造。
片麻岩主要由粒状矿物和片状或柱状矿物组成，其中粒状矿物大于50％或更多，且长石多于石英。是指具有中粗粒鳞片粒状变晶结构，片麻状、条带状或条痕状构造并含长石较多的岩石，

完形填空

阅读下面短文，并借助上下文和插图补充所缺信息，每个空只需填写一个形式正确、意义相符的英语单词。请将答案写在答题卡相应题目的答题位置上。

Sam is a farmer. He has a very big  小题1:. On the farm, he grows oranges, grapes and bananas. Many people come to  小题2: his farm. He is a successful young man and becomes very famous.

Several years ago, in 2003, he went back to his hometown after he finished high school. “What can I do?” he said to himself. Then he had 小题3:idea. “I’m  小题4:in farming. I can grow fruit!” He began to watch many programs about growing fruit 小题5:TV. He also read a lot of books about

it. Then he went to 小题6: on Mr. Smith’s farm for two years. He learned a lot there. In 2005, he started his own fruit farm. At that 小题7:, Sam’s farm was small. But now, his farm is much  小题8:.

His fruits are very good .He sends them to many big   小题9:  in China, such as Shanghai, Beijing and Guangzhou. He also grows vegetables and raises  小题10:on his farm. Therefore, his family eats their own vegetables and chicken. They have a very healthy lifestyle.
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选择题

决战东北采取了“关门打狗”的战略。这里的“门”指的是       [ ]

A．长春    

B．塔山、黑山、大虎山  

C．锦州    

D．沈阳
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