问题 问答题 论述题

评述邓哈姆的碳酸盐岩结构分类。

答案

参考答案:

邓哈姆根据颗粒和泥的相对含量,把常见的颗粒-灰泥石灰岩分为四类,即颗粒岩、泥质颗粒岩、颗粒质泥岩、泥岩。颗粒岩几乎全由颗粒组成,不含泥或含泥很少。泥质颗粒岩主要由颗粒组成,颗粒与颗粒是接触的,其粒间孔隙中充填着泥。颗粒质泥岩主要由泥组成,还有少量颗粒分散于泥中,互不相接。泥岩几乎全由泥组成。邓哈姆还分出两类特殊的石灰岩即粘结岩和结晶碳酸盐岩,粘结岩在沉积作用过程中,原始组分被粘结在一起,其标志有连生骨骼物质,与重力作用相反的纹理。结晶石灰岩是沉积结晶的碳酸盐岩。

阅读理解

One night, as Diaz stepped off the train and onto a nearly empty platform, a teenage boy approached and pulled out a knife.

“He wanted my money, so I just gave him my wallet and told him, ‘Here you go ’” Diaz says.

As the teen began to walk away, Diaz told him, “Hey, wait a minute. You forgot something. If you’re going to be robbing people for the rest of the night, you might as well take my coat to keep you warm.”

The robber looked at him puzzled, saying, “Why are you doing this?”

Diaz replied, “If you’re willing to risk your freedom for a few dollars, then you must really need the money. I mean, all I wanted to do was get dinner and if you really want to join me…..”

Diaz says he and the teen went into a diner and sat in a booth.

“The manager comes by, the dishwashers come by, the waiters come by to say hi,” Diaz says.

The kid said, “You know everybody here. Do you own this place?”

“No, I just eat here a lot,” Dias said. “But you’re even nice to the dishwasher,” he said.

Diaz replied, “Well, haven’t you been taught you should be nice to everybody?”

“Yea, but I didn’t think people actually behaved that way,” the teen said.

When the bill arrived, Diaz said, “You’re going to have to pay for this bill because you have my money and I can’t pay for this. So if you give me my wallet back, I’ll gladly treat you.”

The teen returned it immediately. “I gave him $20…. I figure maybe it’ll help him.” Diaz says he asked for something in return--- the teen’s knife--- “and he gave it to me.”

Afterwards, when Diaz told his mother what happened, she said, “You’re the type of kid that if someone asked you for the time, you gave them your watch.”

“I figure, you know, if you treat people right, you can only hope that they treat you right. It’s as simple as it gets in this complicated world.”

小题1:What did Diaz do to the teen?

A.He gave the teen a new wallet

B.He treated the teen to dinner

C.He gave his coat to the teen

D.He taught the teen a lesson小题2:From the passage we can infer that the boy _______.

A.expressed his gratitude for Diaz’s kindness

B.gave up the idea of robbing in the end

C.wasn’t taught how to be nice to everybody

D.gave the knife to Diaz in return for his forgiveness小题3:For what Diaz did, his mother showed an attitude of _______.

A.complaint

B.concern

C.criticism

D.praise小题4:By telling the story of Diaz, the author intends to tell us ______.

A.to keep calm in danger

B.not to go out alone at night

C.to treat others kindly

D.not to harm others on purpose

单项选择题