问题 选择题

原始大气中形成简单的有机物的条件是(  )

①雨水 ②高温 ③紫外线 ④原始海洋 ⑤雷电.

A.①②③

B.③④⑤

C.②③⑤

D.①③⑤

答案

化学起源学说认为:原始大气在高温、紫外线以及雷电等自然条件的长期作用下,形成了许多简单的有机物,随着地球温度的逐渐降低,原始大气中的水蒸气凝结成雨降落到地面上,这些有机物随着雨水进入湖泊和河流,最终汇集到原始的海洋中.原始大气在高温、雷电以及紫外线的长期作用下,形成了许多简单的有机物.在原始地球的条件下是完全可能实现的.因此原始大气形成简单有机物的自然条件是高温、雷电和紫外线.原始的海洋就像一盆稀薄的热汤,其中所含的有机物,不断的相互作用,经过及其漫长的岁月,逐渐形成了原始生命.故C符合题意.

故选:C.

阅读理解

阅读理解。

     Foreign visitors are often puzzled in Japan because most streets there don't havenames. In Japan,

people use landmarks instead of street names. For example, the Japanese will say to travelers," Go

straight down to the corner. Turn left at the big hotel and go past a fruit market. The post office is just

across the bus stop. " In the Midwest of America, usually there are not many landmarks. There are

no mountains. So the land is very flat. In many places there are no towns or buildings within miles.

Instead of landmarks, people will tell you directions and distance. In Kansas (堪萨斯州) , for example,

people will say, "Go north two miles. Turn east, and then go another mile. "

     People in Los Angeles, California, have no idea of distance on the map. They measure (测量)

distance by telling time. "How far away is the post office?" you ask. "60h," they answer, "it's about

five minutes from here, "You say, "Yes, but how many miles away is it?" They don't know.

     People in Greece sometimes do not even try to give directions because few visitors understand

the Greek language. Instead of giving you the direction, a Greek will often say, "Follow me."Then

he'll lead you through the streets of the city to the post office.

      Sometimes a person doesn't know the answer to your question. A New Yorker might say, "Sorry,

I have no idea." But in Yucatan, Mexico (墨西哥), no one answers "I don't know. " People in Yucatan

think "I don't know" is not polite. They usually give an answer, often a wrong one. A visitor can get

very, very lost in Yucatan!

     One thing will help you everywhere. You might not understand a person's words, but maybe you

can understand his body language. He or she will usually turn and then point in the correct direction.

Go on in that direction and you may find the post office! 

1. What does the word "landmarks" mean?

A. Street names.

B. Building names.

C. Hotels,markets and bus stops.

D. Buildings or places which are easily seen.

2. 根据短文内容和句意,填入一个适当的单词。

     People in _____ prefer to tell you directions and distance if you ask for the way.

3. 把下面的句子译成汉语。

     People in Greece (希腊)sometimes do not even try to give directions because few visitors understand the Greek language.     

     _____________________________________________________________________________

4. 通过短文内容回答问题。

     Why don't people in Yucatan say,"I don't know" to a person who asks for the way? 

     _____________________________________________________________________________

5. 通过短文内容回答问题。

     What does the passage mainly tell us?  

     _____________________________________________________________________________

单项选择题 A1型题