题目内容

实数集是可测集。

A. 对
B. 错

查看答案

搜索结果不匹配？点我反馈

更多问题

Part ⅠWriting ( 30 minutes )Directions:Write a composition on the following topic with the hints given below.1. The Marvels of Medicine in the Twentieth CenturyYour composition should contain the following ideas:Introduction: Advances in medical science — the most important achievements made in the twentieth century1. Development of vaccines and antibiotics2. Discoveries of new diagnosis methods3. Advent of genetic engineering, a new branch of biologyConcluding remarks: Even greater wonders to be wrought in the 21st century

Part ⅣTranslation ( 5 minutes )Directions:Translate the following paragraph(s) into English (with the given words or phrases).

Section ADirections:In this section, there is a passage with several blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. You may not use any of the words in the bank more than once.Questions 27-36 are based on the following passage.Three years ago, a study of overfishing led to 27 debate. It warned that the world's ocean fish could be almost gone by the middle of the century. Now, a new study offers more hope. It shows that the risk of fisheries 28 has recently decreased in some areas – some, but not all. "This means different regions are 29 in different directions and some regions have indeed begun to get rid of overfishing." Boris Worm at Dalhousie University in Canada and Ray Hilborn at the University of Washington in Seattle were lead authors of the new study. Professor Hilborn 30 disagreed with those findings of the earlier study. The result is – the two scientists agreed to work together on a new study.They led a team that studied ten areas. In five of them, the rate at which fish are being taken out of the sea has dropped to a level that should let the populations 31 . Three areas still had overfishing, but corrective measures have begun. Yet, in all, almost two-thirds of fish populations studied worldwide still need 32 . Only two areas did not have an overfishing problem in either the new study or the 33 one. The new study found that overfishing has been reduced in Canada's Newfoundland-Labrador area and in Iceland and southern Australia.Using nets that let smaller fish escape and agreeing not to fish in certain areas can help reduce overfishing. The study showed that these measures helped fish populations 34 in Kenya. But one of the authors of the study, Tim McClanahan from the Wildlife Conservation Society, says fisheries in Africa face another 35 . Most countries in Africa are selling fishing rights to industrialized nations which catch large amounts of seafood. The study shows what happened when industrialized nations increased 36 on fishing in their own waters.

Section BDirections:In this section, you are going to read a passage with ten statements attached to it. Each statement contains information given in one of the paragraphs. Identify the paragraph from which the information is derived. You may choose a paragraph more than once. Each paragraph is marked with a letter. Answer the questions by matching the corresponding letter with each statement.Liter of Light[A] 2015 is UNESCO’s International Year of Light, throughout which innovative light based technologies will be showcased. For the majority of people who spend life surrounded by artificial light, in the home, in the workplace and on the streets, it might seem something so mundane as to not require any particular attention. However, today, more than a quarter of the world’s population lives in darkness.[B] According to UNESCO, more than 1.5 billion people currently have no access to electrical light, and about 1.3 billion of them spend up to half of their income on paraffin (煤油) to light their homes. Paraffin kills 1.5 million people a year in fires, or from associated health problems such as bronchitis and cancer. Inhaling paraffin smoke regularly is equivalent to smoking four packets of cigarettes a day.[C] The need for clean, affordable alternatives is obvious, which is why one charity, Liter of Light, has pledged to create a million green, off-the-power grid lights in 2015 using an ingenious design, a solar powered light that is cheap and easy to assemble and whose main feature is a plastic bottle: the kind that holds a liter of carbonated drink, and that is usually thrown away once empty.[D] The original Liter of Light group was formed in 2011 in the Philippines by the MyShelter Foundation, a charity offering sustainable building solutions for storm-damaged communities. Its founder, Illac Diaz, was shocked by living conditions he saw in rural areas of the Philippines hit by severe storms during his work as telecoms manager. He began to think about ways of providing cheap and durable replacement buildings in these areas. He left his job to study alternative architecture and urban planning in the U.S. There he came across the original bottle light developed by a Brazilian mechanic, Alfredo Moser, in 2002. Diaz hit upon the idea of using the technology in light poor and storm-damaged homes after seeing videos of it being put to similar use in Haiti. He returned to his home country and set up MyShelter Foundation in 2006. In 2011, it created Liter of Light, installing solar bottles in more than 15,000 homes in and around the capital, Manila.[E] The technology is disarmingly simple — a plastic bottle filled with bleached water installed in the roof of a building so that daylight from outside refracts through the water into the room, providing equivalent brightness to a 50-watt conventional bulb in full daylight.[F] Now, the charity has chapters in 53 countries and has installed at least 350,000 daytime lights and about 15,000 night lights which use a solar panel to provide power for 4 LED bulbs. The LEDs are housed inside the protective bottle with the solar panel screwed into the top. The three-watt lights provide enough brightness to light a 15sq meter room. With the addition of a 10ft PVC pipe, or pole made from bamboo or wood, the device can be transformed into a street lamp. More importantly, all of the components are open-sourced and can be built from scratch.[G] The fact that the technology is not owned by a multinational corporation is hugely important in the charity’s bottom-up approach. Liter of Light provides a model where individual entrepreneurs can learn to make and install the devices and sell them to their communities for a small profit, thus kick starting grassroots green economies such as the one in San Pedro Laguna in the Philippines where a single local entrepreneur has installed 11,000 solar bottles.[H] The global success of the idea has led to projects around the world. In Pakistan, a local Liter of Light organizer has installed 100 street lights in the UN’s Jalozai refugee camp, one of the country’s largest. The camp was severely over-crowded and the average refugee had no access to light. For the Year of Light, the plan is to install another 450 lights in the camp and 400 in a fishing village on the coast. The plan is to ensure that all facilities in the village, the houses, washrooms, community places, worship places, shops are adequately lit and furthermore that locals are taught how to replicate the technology.[I] In Egypt, Liter of Light, backed by Pepsi, will provide lights for villages and 35 schools. However, it is in Columbia where perhaps the most ambitious projects are taking place. Liter of Light Colombia has developed its own version of the technology to provide lighting 300% more powerful than yellow street lights at just 2% of the cost. They have a lifespan of 70,000 hours, that’s six years of light and can shine for 3 consecutive nights without recharging. This year, 2,000 more will be installed in some of Colombia’s off-grid, conflict-torn areas; a significant and simple step towards making these communities safer is to illuminate their streets.