1、.阅读理解Three divers enter a hole leading to a waterfilled cave on Mexicos Yucatan Peninsula. They swim for an hour. Finally, they reach a large room 60 feet underground and about the size of two basketball courts. Here, they discover an upsidedown human skull. Other bones lie nearby.The team came acro
2、ss the skull in 2007. The divers then told the Mexican government about the finding. Soon the government formed a team of scientists to look into it. The group, which included archaeologist Dominique Rissolo, believed that the skull belonged to someone who lived in the last ice age. At the ice age s
3、ome twenty thousand years ago, sea levels dropped and new land appeared. Over time, rain and wind ate holes into some of the land. “The person may have died after entering the cave，” Rissolo says. Then, when the ice age ended some ten thousand years ago, sea levels rose. Water flooded the cave, cove
4、ring the remains.Worrying that moving the skull might destroy it, scientists decided to examine it at its watery resting place. They collected information about the skull and other pieces of bones. They found that the bones belonged to a 15 to 17yearold girl who lived at least twelve thousand years
5、ago. The team named her after a type of water nymph (仙女) in Greek myths: the Naiads (Naia)Naia is the oldest nearly complete human skeleton (骨架) ever found in the Americas. DNA tests showed that shes a direct ancestor of presentday Native Americans. Naias DNA also matches with people native to Siber
6、ia, a part of Russia. Scientists have long thought that ancient people from this area arrived in Alaska during the last ice age. They were the first humans to live in the Americas. And Naia proves how far south they went.In 2014 the scientists decided to bring up Naias skull from the cave to protect
7、 it from curious divers. So it was taken to a lab, where it remains today.文章大意：本文是一篇说明文。三名潜水者在位于墨西哥的尤卡坦半岛的一个洞穴里发现了一个头骨。这掀起了一场考古行动。1. What can we learn about the skull?AIt was left alone in the cave.BIt lay under a basketball court.CIt drew the governments attention.DIt was discovered by three scient
8、ists.答案：C解析：推理判断题。由文章第二段第一句至第三句可知，潜水者发现了头骨之后，将这一发现报告给了墨西哥政府。不久之后，政府派遣了一个由科学家组成的小组去调查这个发现。由此可以推知，这一发现引起了政府的关注。故选C。2. Why was the skull studied in the cave?AScientists tried to protect it.BThe temperature was fine there.CIt was against the law to take it out.DIt would help scientists study the cave.答案
9、：A解析：细节理解题。由文章第四段第一句“Worrying that moving the skull might destroy it, scientists decided to examine it at its watery resting place”可知，科学家们担心移动这个头骨会破坏它，所以他们就在发现它的地方研究它。所以，科学家们在山洞里研究头骨是为了保护头骨。故选A。3. Who were Naias distant ancestors?AEarly humans in Greece.BEarly humans in Siberia.CEarly humans in Alas
10、ka.DEarly humans in Mexico.答案：B解析：推理判断题。由文章第五段中的“Naias DNA also matches with people native to Siberia.they went”可知，Naia的DNA还和西伯利亚原住民的DNA相吻合。科学家们认为来自西伯利亚的古人们在最后一个冰河世纪到达了阿拉斯加。他们是最早生活在美洲的人。Naia证明了他们向南迁移了多远。由此可知，Naia的远祖是西伯利亚的原住民。故选B。.七选五Natural sites and historic buildings, when left alone, can slowly b
11、e in bad condition. _1_ For these reasons we must protect them.“World Heritage” is the title given to places chosen from natural sites and buildings around the world. These places are considered special, valuable and require protection. They may be places of the natural or cultural heritage that are
12、 the pride of the people in the country. _2_ Each is a treasure of our planet that must be protected for us and our future generations.Even extremely beautiful natural environments can be in bad condition if they are left alone. _3_ For instance, the Galapagos Islands are now protected by rules that
13、 stop people from bringing or removing plants and animals to or from the islands, moving rocks and touching the animals. In the US, people are not allowed to visit the Grand Canyon National Park by vehicle. It aims to protect the parks environment from the gas produced by cars. _4_ Australia is maki
14、ng stricter laws to prevent agricultural chemicals from flowing into the ocean near the Great Barrier Reef. Efforts are also being made to protect natural heritage sites in Japan. In Shiretoko, only a small number of people are allowed to walk on its nature path at the same time. _5_AThey may also b
15、e home to endangered species. BToday there are 209 natural heritage sites around the world. CPeople can change these places too, just as the wind and rain can.DThats why measures are being taken around the world to protect them.E. It can reduce the risk of people accidentally stepping on valuable pl
16、ants.F. Natural heritage is valued for geographical characteristics and beautiful scenery.G. There are even security guards who can arrest people that break the rules.文章大意：本文是一篇说明文。文章告诉我们一定要保护自然遗址和历史建筑，如果没人保护它们，它们的状况就会变得很糟糕。1C解析：根据空前“Natural sites and historic buildings，when left alone，can slowly be
17、 in bad condition”可知，当没人管理自然遗址和历史建筑的时候，它们可能会慢慢地处于糟糕的状态。再根据空后的“For these reasons we must protect them”可知，出于这些原因，我们必须保护它们。C项“人们也可以改变这些地方。就像风和雨一样”符合语境，也是原因之一。2A解析：根据空前“They may be places of the natural or cultural heritage that are the pride of the people in the country”可知，它们可能是自然或文化遗产胜地，是这个国家人民的骄傲。A项“
18、它们也可能是濒危物种的家园”符合上下文语境。A项中的may also be和上文中的may be places相呼应。故选A。3D解析：根据空前“Even extremely beautiful natural environments can be in bad condition if they are left alone”可知，即使是非常美丽的自然环境，如果它们不被理会，也会处于糟糕的状态。D项“这就是为什么全世界都在采取措施保护它们”与上句构成因果关系，符合上下文语境。4G解析：根据上文内容可知，本段主要说的是保护措施，故G项符合语境。G项中的even表达了上下句之间的递进关系。5E解析：根据空前“In Shiretoko，only a small number of people are allowed to walk on its nature path at the same time”可知，E项“这样就可以减少人们不小心踩到珍稀植物的风险”符合语境。前后是一种因果关系，人越少自然就越不容易踩到植物。故填E。