阅读理解。 Have you ever dreamed about a trip to space? Seeds (种子)of some v

题文

阅读理解。   Have you ever dreamed about a trip to space? Seeds (种子)of some vegetables and crops are a lot luckier than you, as they have travelled to space and back.     China is among the three countries in the world that carry out agricultural (农业的)rearch in space.The others are Russia and the U.S. Since 1987, China has nt about 1000 kinds of eds into space. The include green peppers, tomatoes, cucumbers, carrots and rice. Even on China's first manned spacecraft Shenzhou V there were some eds from Taiwan.     "Conditions(条件) in outer space such as radiation(辐射)and low gravity can cau big changes in the eds," said Chine rearcher Jin Xing.     But not all eds are better after going to space. After returning to the earth, the best eds are chon. The eds produce much more and also grow faster than normal eds. As the safety of genetically modified(转基因)food is still being talked about, some people are not sure about the safety of the "space vegetables" becau some of their genes(基因)are changed during the trip to space.    But Jin holds the more hopeful view. He said, "Unlike genetically modified crops, no new genes are introduced to the space vegetables, so they are surely safe."    Space vegetables are better than normal vegetables. For example, space tomatoes stay fresh for twenty days, which is one week longer than normal tomatoes. Another popular space vegetable is the peppers. Space peppers have 20 per cent more vitamin C than normal peppers.    Rearchers are considering holding a tomato festival. By the time people will be able to enjoy about 30 different kinds of space tomatoes on their dining tables.So far, the Chine Academy of Sciences has t up three space vegetable ba fields, one of which is in Shenzhen while the others are in Beijing and Jiangsu Province. 1. What will happen when eds of some vegetables are nt to space and carried back?A. Some of their genes are changed.      B. They are all better than before going to spaceC. No changes are caud in the eds.    D. They all produce much more and grow faster.2. Why does Jin Xing have no doubt about the safety of the space vegetables?A. Becau the eds nt to space stay the same. B. Becau the eds nt to space are the best. C. Becau no new genes are brought into them. D. Becau space vegetables are luckier. 3. Which of the following statements is TRUE?A. Genetically modified food is completely safe. B. The space vegetables don't belong to genetically modified food in some ways. C. about 1000 kinds of eds were nt into space on Shenzhou V.  D. Seeds back from space must be planted in special rooms controlled by computers. 4. What is the underlined word "cucumber" in the cond paragraph? A. A product from Russia.            B. A kind of gene. . C. A product from Taiwan.           D. A kind of agricultural product.

题型：未知 难度：其他题型

答案

1-4 ACBD

点击查看科教类阅读知识点讲解,巩固学习

解析

该题暂无解析

考点

据考高分专家说，试题“阅读理解。 Have.....”主要考查你对 [科教类阅读 ]考点的理解。

科教类阅读

科普类的阅读：科普类的阅读理解包含介绍科学知识、社会知识的短文。阅读这类短文时，要以事实为中心进行思考，抓住事物的特征、用途、相互关系等。如果是介绍社会现象的文章，要掌握所谈现象的内涵。

答题技巧：1. 加强整体意识，把握文章的主要内容。在阅读的时候可给段落标上序号，并给重要的句子和   关键词做上记号，尤其是各段中心句，为答题提供更快捷更多的信息源。 2. 审清题干，发觉和把握试题中有效的提示性信息，确认命题的角度、阅读范围和答题方式。 3. 定位阅读，强化对应意识。同时要注意原文利用和自我加工相结合。