问题 单项选择题

根据材料回答下列问题
大连商品交易所的某商品期货保证金比率为5%,维持保证金比率为75%,假若某客户以2700元/吨的价格买入5张某商品期货合约(每张10吨)后的第三天,某商品结算价下跌至2600元/吨。

目前,我国发行的债券一般是每张面值为( )元的人民币。

A.50

B.1000

C.100

D.10000

答案

参考答案:C

解析: 目前,我国发行的债券一般是每张面值为100元的人民币。

阅读理解

The air pollution was so bad in Harbin, in China, on October 21,2013 that the city had to close roads and schools, and cancel* hundreds of flights from its airport.

News reports said the smog (a mixture of smoke and fog) was so thick that people couldn’t see more than 10 or 20 metres in front of them.

It is also said that people could not even see the person standing next to them. The city’s website said: “You can’t see your own fingers in front of you.”

The local people said there was a “burning” smell in the air. Many people covered their noses and mouths with scarves or masks*.

The pollution was caused on several factors* including: farmers burning off old corn stalks* and crop stubble*; coal*-fired heating systems; and low winds that allowed the smoke to remain over the city.

The smog had been building up for several days. It became worse when the city turned on the public heating system, which uses coal to heat millions of homes and offices in the city.

Harbin has a population of more than 10 million people. It lies in northeastern China, where cold winter weather can last up to six months. The main fuel* there is coal, because it is cheaper than other types of fuel.

Air pollution from burning coal can cause health problems like heart disease. During the smog crisis* in Harbin, the number of people taken to the hospital with breathing problems was 30% higher than usual.

The city government is trying to reduce its use of coal by adding more insulation* and better roofs and windows to buildings to reduce heating needs. It has also used cleaner fuel for cars and factories.

小题1:The roads and schools in Harbin had to be closed on October 21, 2013 because of  ____

A.the heavy rain

B.the strong wind

C.the serious smog

D. the terrible snow小题2:There are many reasons for the air pollution EXCEPT____________.

A.farmers burn off old corn stalks and crop stubble

B.people use coal to heat millions of homes and offices

C.The smoke remains over the city because of low winds

D.Many buses and cars use cleaner fuel and so do factories.小题3: What is the government trying to do when the air pollution get worse?

A.To offer cars new fuel.

B.To give people more masks.

C.To reduce its use of coal.

D.To ask people to stay at home.小题4:What does the passage mainly tell us?

A.The serious air pollution in China

B.Coal-fired heating systems

C.The population crisis in Harbin

D.The reasons for heart disease

阅读理解与欣赏

“能吞能吐”的森林

森林涵养水源,保持水土,防止水旱灾害的作用非常大。据专家测算,一片10万亩面积的森林,相当于一个200万立方米的水库,这正如农谚所说的:“山上多栽树,等于修水库。雨多它能吞,雨少它能吐。”森林因这种特殊的“吞吐”功能而被科学家称之为“吞水吐雨器”。

说起森林的功劳,那还多得很。它除了为人类提供木材及许多种生产生活的原料之外,在维护生态环境方面也是功劳卓著,它用另一种“能吞能吐”的特殊功能孕育了人类。因为地球在形成之初,大气中的二氧化碳含量很高,氧气很少,气温也高,生物是难以生存的。大约在四亿年前,海里的先进植物登陆,陆地才产生了森林。森林慢慢将大气中的二氧化碳吸收,同时吐出新鲜的氧气,调节气温,这才具备了人类生存的条件,地球上才最终有了人类。所以科学家又称森林是“吞碳吐氧机”。

森林,是地球生态系统的主体,是大自然的总调度室,是地球的绿色之肺。森林维护地球生态环境这种“能吞能吐”的特殊功能是其他任何物体都不能取代的。因此,我们必须高度重视植树造林,并且保护好森林。目前,值得我们每个人关注的是地球的绿色之肺在日益萎缩。近200年间,地球上的森林已有三分之一以上被采伐和毁掉。而另一方面,由于地球上的燃烧物增多,二氧化碳的排放量在急剧增加。此消彼涨,使得地球生态环境急剧恶化,主要表现为全球气候变暖。全球气候变暖对人类的生产和生活有着巨大的影响,甚至威胁人类生存。因为全球气候变暖,水分蒸发加快,改变了气流的循环,使气候变化加剧,从而引发热浪、飓风、暴雨、洪涝及干旱。

为了使地球的这个“能吞能吐”的绿色之肺恢复健康,以改善生态环境,抑制全球变暖,减少水旱等自然灾害,我们应该大力提倡植树造林,使每一座荒山都绿起来。

小题1:地球上的森林有什么功能?请根据文意简要回答。(4分)

小题2:全球气候变暖的主要原因是什么?(请分点概括回答)(4分)

小题3:第三段中划线词“近百年间”“三分之一以上”能否删去?为什么?(3分)

小题4:森林遭到破坏以后,地球上的生态环境急剧恶化。除了文中介绍的全球气候变暖外,还有哪些方面的恶化?请举出三例。(3分)