1 . 阅读理解。
Is there link between humans and climate change or not? This question was first studied in the early 1900s. Since then, many scientists have thought that our actions do make a difference. In 1997, the Kyoto Protocol explained our role in the Earth’s changing atmosphere and set international limits for gas emissions(排放) from 2008 to 2012. Some countries have decided to continue these reductions until 2020. More recently, the Paris Agreement, stuck by nearly 200 countries, also aims to limit global warming. But just now how much warmer it will get depends on how deeply countries cut carbon emissions.

1. It can be concluded from paragraph 1 that _______.

A．the problem of global warming will have been quite solved by 2020

B．gas emissions have been effectively reduced in developed countries

C．the Paris Agreements is more influential than the Kyoto Protocol

D．humans have made continuous efforts to slow down global warming

2. If nations could only keep the initial promises of the Paris Agreement, what would happen by the year 2100?

A．The human population would increase by one third.

B．Little over 50% of all species would still exist.

C．Nations would not need to tighten their emissions targets.

D．The Agreement’s minimum goal would not be reached.

3. If those island nations not far above sea level are to survive, the maximum temperature rise, since the start of the industrial age, should be_______.

A．0.8℃	B．1.5℃
C．2℃	D．3.5℃

2 . Directions: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need
agree                 suffer             system            notice               through
dangerous        space            limited       absorbs            let out

For years scientist have been worried about the effects of air pollution on the earth’s natural conditions. Some believe the air inside many houses may be more     1     than the air outside. It may be one hundred times worse.

Indoor air pollution can cause a person to feel tired, to     2     eye-pain, headache and other problems. Some pollutants can cause breathing disorders, diseases of blood and even cancer. Most scientists     3     that every modern house has some kind of indoor pollution. People began to     4     the problem in the early 1970s, when it was that builders began making houses and offices which did not waste energy. To do this they built buildings that     5     the flow of air between inside and outside. They also began using man-made building materials. These materials are now known to     6     harmful gases. As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control     7     for building green plants. Scientist do not really know how plants control air pollution. They believe that a plant’s leaves take in the pollutants. In exchange the plant produces oxygen     8     its leaves and through its tiny organizations on its roots. Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square meters of space. Studies of different plants show that each     9     different chemicals. So the most effective way to clean the air is to use different kinds of plants. Having green plants inside your house can make it a prettier and healthier place.

3 . A rainforest is an area covered by tall trees with the total high rainfall spreading quite equally through the year and the temperature rarely dipping below l6℃. Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate. Without the forest cover，these areas would reflect more heat into the atmosphere，warming the rest of the world. Losing the rainforests may also influence wind and rainfall patterns，potentially causing certain natural disasters all over the world.
In the past hundred years，humans have begun destroying rainforests in search of three major resources（资源）：land for crops，wood for paper and other products，land for raising farm animals. This action affects the environment as a whole. For example，a lot of carbon dioxide（二氧化碳）in the air comes from burning the rainforests. People obviously have a need for the resources we gain from cutting trees but we will suffer much more than we will benefit.There are two main reasons for this. Firstly，when people cut down trees，generally they can only use the land for a year or two. Secondly，cutting large sections of rainforests may provide a good supply of wood right now，but in the long run it actually reduces the world’s wood supply.
Rainforests are often called the world’s drug store. More than 25％ of the medicines we use today come from plants in rainforests. However，fewer than l％of rainforest plants have been examined for their medical value. It is extremely likely that our best chance to cure diseases lies somewhere in the world’s shrinking rainforests.
1. Rainforests can help to adjust the climate because they      

A．reflect more heat into the atmosphere

B．bring about high rainfall throughout the world

C．rarely cause the temperature to drop lower than l6℃

D．reduce the effect of heat from the sun on the earth

2. What does the word “this” underlined in the third paragraph refer to?

A．We will lose much more than we can gain.

B．Humans have begun destroying rainforests.

C．People have a strong desire for resources.

D．Much carbon dioxide comes from burning rainforests.

3. It can be inferred from the text that

A．we can get enough resources without rainforests

B．there is great medicine potential in rainforests

C．we will grow fewer kinds of crops in the gained land

D．the level of annual rainfall affects wind patterns

4. What might be the best title for the text?

A．How to Save Rainforests

B．How to Protect Nature

C．Rainforests and the Environment

D．Rainforests and Medical Development