Read the article and select the best answer. Article: A green roof is a roof of a building that is covered with vegetation over a waterproof membrane . It is a proper method of growing plants on the roof and does not refer to the mere green color of the roof. People benefit a lot from these green roofing systems, and they are gaining popularity day by day. Human beings have occupied major areas of land and transformed them into huge buildings, which has severely affected the environment and the natural habitat of bird and insects. Green roofing compensates for that. It creates a natural habitat for creatures like bees, grasshoppers and other insects. Modern roofs need a lot of energy to control the temperatures in winter and summer. However, green roofs reduce the amount of energy required for controlling temperatures, thus making them energy-efficient. As green roofing is highly energy-efficient, it can act as a encouragement for people who are interested in green roofing systems and their benefits. It will increase the market value of the building and fetch the owner a great share of profit. As the vegetation requires a water supply, there is a inbuilt water preservation layer in the green roof system. This layer helps to keep the rainwater. It makes full use of the rainwater and prevents wastage. During heavy rains, the water runs off the flat roof. The green roof prevents this overflow by slowing down the volume of running water. Green roofs can compensate for the lost greenery in urban areas and increase the artistic value of an area. Your building will look beautiful, coated with green vegetation. Green roofs can serve as local community garden and create a natural atmosphere, giving physical and psychological benefits like reducing stress levels in people and keeping them physically fit. Besides, people can start their own small-scale cultivation and experience the pleasure of gardening. Question: Mr. Black who owns two buildings is interested in the green roofing system probably because _ . Options: A: it can solve the problem of air pollution B: it produces more energy to power the buildings C: it creates natural habitats for birds and insects D: it can save him spending a lot of money on energy
D

Read the article and select the best answer. Article: The bicycling craze came in when we were just about at the right age to enjoy it.At first even "safety" bicycles were too dangerous and improper for ladies to ride, and they had to have tricycles.My mother had(I believe)the first female tricycle in Cambridge;and l had a little one,and we used to go out for family rides,all together;my father in front on a bicycle. and my poor brather Charles standing miserable on the bar behind lny mother.I found it very hard work.pounding away on my hard tyres;a glorious,but not a pleasurable pastinle. Then, one day at lunch, my father said he had just seen a new kind of tyre,filled up,with air,and he thought it might be a success.And soon after that everyone had bicycles,ladies and all; and bicycling became the smart thing,and the lords and ladies had their pictures in the papers,riding along in the park,in straw hats. My mother must have fallen off her bicycle pretty often,for I remember seeing the most appalling cuts and bruises on her legs.But she never complained,and always kept these accidents to herself.However,the great Mrs. Phillips,our cook, always knew all a hout them;as indeed she knew practically everything that ever happened.She used to draw us into the servants' hall to tell us privately:"Her Ladyship had a nasty fall yesterday;she cut both her knees and sprained her wrist.But don't Iet her know I told you."So we never dared say anything.Similar little accidents used to occur when,at the age of nearly Seventy,she insisted on learning to drive a car.She never mastered the art of reversing ,and was in every way an unconventional and terrifying driver. Mrs.Phillips used then to tell us:"Her Ladyship ran into the back of a milk-cart yesterday;but it wasn't much hurt";or"A policeman stopped her Ladyship because she was on the wrong side of the road;but she said she didn't know what the white Line on the road meant,so he explained arld Let her go on."Mrs.Phillips must have had an excellent Intelligence Service at her command,for the stories were always true enough. Question: Cycling became popular when _ . Options: A: the writer's father popularized it B: air-filled tyres began to be used C: noble people started enjoying it D: newspapers had pictures of cyclists
B

Q: Read the article and select the best answer. Article: Scientists from China, Sweden and the United Stated have developed a high-producing rice that can reduce methane emission , a major greenhouse gas blamed for global warming, from rice fields, according to a paper published on the latest issue of Nature. By inserting a barley gene into rice, Sun Chuanxin and his colleagues created SUSIBA2 Rice, which stores more starch in the section of the rice above ground, according to a paper published on the latest issue of Nature.This means the grains will have more starch while the root will exude less nutrients that will later be turned into methane by microbes in the soil, Sun, who works with Swedish University of Agricultural Sciences, told Xinhua. "It solves two major problems mankind faces at one time: environmental degradation and the need for increased grain output," Wang Feng, another scientist, said, adding that the rice can cut methane discharge by more than 90 percent during summer and more than half during autumn, as "the rice displays a greater emission reduction effect in high temperatures." Meanwhile, small-scale trials have also suggested an increased output: a single plant of the new breed has 300 more grains with a starch content 10 percent higher. Wang said the team is working on applications for the rice in different areas, seasons and using different farming techniques. "It's still far away from mass application, but at least we see the light of hope." Human-induced methane, though less abundant than carbon dioxide in the air, is responsible for 20 percent of the global warming effect. Rice paddies are the largest single source of methane linked to human activity. According to the Ministry of Agriculture, China produces 209 million tons of rice in 2014, or 28 percent of the world's total of 734 million. Question: What can we learn from the text? Options: A: Scientists will soon grow the new rice in large areas B: Human-related methane contributes most to global warming C: China may contribute greatly to global warming reduction D: Rice fields will be reduced all over the world
A: C