【正文】 re happy, but to slow down dramatically when we39。故選A。根據(jù)第五段中的“To learn more about just how wolves are beneficial, a short documentary from Quest explains how the presence of wolves influences the behavior of deer, which eventually makes entire ecosystems more biologically diverse and healthy.”可知，拍攝紀(jì)錄片的目的是了解狼是如何對生態(tài)有益的。The fear of wolves is beneficial to ecosystems.B.To introduce how wolves behave in the wild.B.d never have seen these responses if the park hadn39。 （3）考查細(xì)節(jié)理解。 （1）考查細(xì)節(jié)理解。B.D.increase tobacco plants39。To serve the science experiment smoothly.（3）In the future, the genetic changes will be used to. A.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。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. s genes in order to make it use sunlight more quickly. Someday, the results could increase the amount of food produced around the world. 因此本文的最好的題目就是“狗能識別人的情緒”。根據(jù)第五段中的They guess it may be because dogs find angry faces disgusting, causing them to withdraw quickly以及However可知，與前面意思相反，以及劃線詞后的disappear可知once the smart dogs realized they were getting rewarded, the trepidation seemed to disappear.…此句為，狗看到生氣的表情后會感到厭惡，并由此退縮，但是一旦聰明的狗意識到會有獎勵之后，它們的恐懼以及退縮就會消失。s because the scientists believe humans show their emotions on their entire face.根據(jù)最后一段中的““ watts per square meter of area burned are soaked up by the earth from greenhouse gases, but watts per square meter will be sent back into space.”可知該詞與send back該詞相反的意思，故應(yīng)該指吸收，因為send back指反射。根據(jù)第二段中的“This finding suggests that taking steps to prevent northern forest fires to limit the release of greenhouse gases may warm the climate in northern regions”這樣的措施最終導(dǎo)致了北部地區(qū)的氣候變暖。suggest that the fires will speed up climate warming（4）The underlined phrase soak up in the last paragraph most probably means ________. A.protect the forests and the environment there（2）The following are all the immediate effects after a forest fire EXCEPT ________. A. Against the supposition that forest fires in Alaska, Canada and Siberia warm the climate, scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror more sunlight into space.lead to a longer fire seasonD.suggest that people should take measures to protect the environmentD.created （1）考查細(xì)節(jié)理解。 （4）考查推理判斷。 Interestingly, the dogs were not provided with the entire face. Some dogs were shown only upper halves while the others observed lower halves. That39。 （2）考查詞義猜測?，F(xiàn)在，有證據(jù)表明這是正確的”，接著在下文用硬實證明了這一點。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。 Specifically, scientists hacked the plant39。 The new study sped up the process. By changing the plant39。They will have more beautiful flowers.To help leaves of the plants absorb sunlight.D.B.Photosynthesis and production【答案】 （1）B（2）B（3）D（4）A 【解析】【分析】本文是一篇說明文，科學(xué)家通過改變植物的基因，加快光合作用的速度，使植物葉子生長迅速，從而提高植物產(chǎn)量。故選B。 Yellowstone has benefited from the reintroduction of wolves in ways that we did not anticipate, especially the plexity of biological interactions（互動） in the park, explained Mark Boyce, a professor in the Department of Biological Sciences. We were really surprised at that and we39。 To learn more about just how wolves are beneficial, a short documentary from Quest explains how the presence of wolves influences the behavior of deer, which eventually makes entire ecosystems more biologically diverse and healthy. In this documentary, biologist Aaron Wirsing explored why wolves and other top predators （捕食者）were needed for diverse ecosystems to develop. Using a simple video camera, Wirsing is gaining a unique view point on predatorprey relationships and changing the way we think about wolves.Understand.Accept.（2）For what purpose was a documentary made? A.It provides evidence that wolves are endangered animals.（4）What is the main idea of the passage? A. （2）考查細(xì)節(jié)理解。本文主要講述了人類以及其他動物對狼的恐懼對維持健康、平衡的生態(tài)系統(tǒng)是有益的，因為食草動物不會過度繁殖，從而保護(hù)了植物的生長。 As a result, our immune system evolved to run in maximum amounts when we39。immune function and healthBeing negative drains energy from our body, lowering resistance to disease.（4）Which of the following is the best title of the passage? A.D.選C。由此推斷，消極會消耗我們身體的能量，降低對疾病的抵抗力。A new study suggests a link between exposure to greenery and reduced desires for alcohol cigarette and junk food.s view was greenery.s wellbeing, lead author Leanne Martin said in a statement. But for there to be a similar association with desires from simply being able to see green space adds a new dimension to the previous research.根據(jù)第二段中的 （4）考查推理判斷。 It was not an easy task. Sound waves don39。 As for dealing with the root cause of the problem, the UN39。C.s one way to solve the problem according to the text? A.Doubtful.Disapproving.Positive.Uncaring.（4）What is the text mainly about? A.D.s also possible to slow ships down to 18 km/h or less, which is less likely to seriously injure a whale.“也有可能將船只減速到每小時18公里或更少，這樣就不太可能嚴(yán)重傷害鯨魚。通讀全文可知，文章主要講述了海底噪音對海洋生物的影響以及如何降低海底噪音的問題，故選B