【文章內(nèi)容簡(jiǎn)介】 n the ocean, instead of on land, means larger pieces may have survived and can be studied. For this reason, scientists decided to launch the first intentional search for meteorites from the ocean. Until the latest research, scientists had only accidentally discovered a small number of meteorites from drilling operations. The objects recovered from the bottom of the sea likely came from the recent explosion for two main reasons. First, meteorite particles are basically made of glassy materials that do not tend to last long in seawater. Secondly, they came from what looked like a small hole on the seafloor. Some evidence shows that they came from something that fell.（1）What is the current goal of the crew of the Ocean Exploration Trust? A.To recover the rock particles.B.To observe movements of the universe.C.To study unexplored places of the ocean.D.To examine creatures of the explored ocean.（2）What mainly caused the start of the search in the sea? A.A huge meteor shower.B.Business value of meteors.C.Plenty of natural resources.D.The brainstorm of researchers.（3）Why do the scientists prefer to search for meteors in the ocean? A.They can find meteors more easily.B.They may find bigger rock particles.C.They like to explore strange sea areas.D.They have better submarine equipment.（4）What does the author intend to do in the last paragraph? A.Offer clues for the search.B.Give reasons to support a guess.C.Stress the importance of the event.D.Describe the process of the search.【答案】 （1）C（2）A（3）B（4）B 【解析】【分析】本文是一篇說(shuō)明文，科學(xué)家們發(fā)現(xiàn)了他們認(rèn)為是去年墜落地球的流星碎片。這些物體是在美國(guó)太平洋沿岸發(fā)現(xiàn)的。一場(chǎng)巨大的流星雨導(dǎo)致了在海中搜索的開(kāi)始。科學(xué)家更喜歡在海洋中尋找流星是因?yàn)樗麄兛赡軙?huì)發(fā)現(xiàn)更大的巖石顆粒。 （1）考查細(xì)節(jié)理解。根據(jù)第二段中的“The group says its aim at present is to examine areas of the ocean that have never been explored before.”可知，the Ocean Exploration Trust的船員目前的目標(biāo)是研究海洋中未被探索的地方。故選C。 （2）考查推理判斷。根據(jù)第一段中的“Scientists have found what they believe are pieces of a meteor(流星)that fell to the earth last year.”可知，一場(chǎng)巨大的流星雨導(dǎo)致了在海中搜索的開(kāi)始。故選A。 （3）考查推理判斷。根據(jù)第四段中的“The fact that the particles landed in the ocean, instead of on land, means larger pieces may have survived and can be studied.”可知，科學(xué)家更喜歡在海洋中尋找流星是因?yàn)樗麄兛赡軙?huì)發(fā)現(xiàn)更大的巖石顆粒。故選B。 （4）考查推理判斷。根據(jù)最后一段中的“The objects recovered from the bottom of the sea likely came from the recent explosion for two main reasons.”可知，作者在最后一段是想給出支持猜測(cè)的理由。故選B。 【點(diǎn)評(píng)】本題考點(diǎn)涉及細(xì)節(jié)理解和推理判斷兩個(gè)題型的考查，是一篇科普類閱讀，考生需要準(zhǔn)確捕捉細(xì)節(jié)信息，并根據(jù)上下文進(jìn)行邏輯推理，從而選出正確答案。5．犇犇閱讀理解 Hacking isn39。t just for puters and smartphones, According to a study published last week in the journal Science, scientists have found a way to hack a plant39。s genes in order to make it use sunlight more quickly. Someday, the results could increase the amount of food produced around the world. Photosynthesis（光合作用）is the word used to describe how plants use sunlight, water, and carbon dioxide to make their own food. Scientists who conducted the new study say this is a very slow process. Plants use less than 1 percent of the energy available to therm. But by hacking a plant39。s genes, the scientists were able to increase the amount of leaf growth on plants between 14 and 20 percent. Specifically, scientists hacked the plant39。s protective system. Normally, this system is activated when a plant gets too much sunlight, said scientist Krishna Niyogi, coauthor of the study. When the plant senses the light, it gets rid of extra energy and creates more leaves. When the plant is in shade, the protective system is turned off, but the process is slow. Stephen Long is the lead author of the study. He pared a plant39。s protective system to lightadjusting glasses. When a person wears the glasses outside during the day, the lenses（鏡片）darken and lighten depending on how sunny it is. Plants do the same thing, he said. But in plants the adjustment can take anywhere from 10 minutes to an hour. This makes it hard for plants to get the right amount of sunlight needed to create food. The new study sped up the process. By changing the plant39。s genes, the protective system turned on and off more quickly than normal. As a result, leaf growth on the plants scientists used in the study increased. Leaf growth in two plants increased by 20 percent, while leaf growth on a third plant increased by 14 percent. Scientists conducted the study on tobacco plants. But they think the genetic changes will produce the same results in corn and rice. （1）What will happen to the plants when scientists change plants39。 genes？ A.They will bee weaker and weaker.B.They will grow fast to produce more food.C.They will have more beautiful flowers.D.They will depend less on sunlight.（2）Why does the author mention lightadjusting glasses？ A.To warn people of the hot and bright sun.B.To explain the principle of plants39。 protective system.C.To help leaves of the plants absorb sunlight.D.To serve the science experiment smoothly.（3）In the future, the genetic changes will be used to. A.improve tobacco plants39。 qualityB.increase tobacco plants39。 leaves and rootsC.improve the flowers39。 living timeD.increase the production of corn and rice（4）Which of the following can be the theme of this text？ A.Hacking plants for more productionB.Leaf growing more quicklyC.Double product