Read the following article and select the best answer. Article: Machu Picchu is considered to be a truly extraordinary archaeological discovery and is one of South America's largest tourist sites. As many as one thousand visitors visit the ancient Incan ruins daily. What draws vacationers and adventurers to this remote location high in the Andes Mountains of Peru ? A large part of the attraction is the mysteries that surround Machu Picchu. For example, Machu Picchu is considered "the lost city" of the Incas because it was never found by Spanish invaders and was known to only a few local peasants for almost four hundred years. The "city in the clouds", Machu Picchu's lasting beauty comes from the careful blending of its striking architecture with its mountaintop environment. Its greatest skill shows are in the stone structures, which equals that of the ancient Egyptians. The stone blocks were so appropriately cut that they fit together without the need for mud. The largest stones at Machu Picchu weigh as much as fifteen tons! It has been difficult to explain how the huge blocks were transported. The buildings, including many that have survived lots of earthquakes, contain stones which _ so perfectly that a knife cannot be forced between them. When compared to other ancient civilizations, it is difficult to understand how Machu Picchu could have been missed by the Spanish and lost from history for four hundred years. For many of the mysteries of Machu Picchu being unsolved, it is clear why Machu Picchu remains "the most famous ruins in all of South America". Question: The purpose of writing the passage is to _ . - ask us to pay a visit to Machu Picchu - show us the beauty of Machu Picchu - introduce Machu Picchu's mysteries - make the ancient Incan ruins known
introduce Machu Picchu's mysteries

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Read the following article and select the best answer. Article: It is not just humans that get stuck in their ways. Scientists have discovered that old bees have trouble finding their way to new hives as their learning behavior becomes increasingly inflexible. Bees are typically impressive navigators, able to wind their way home through complex landscapes after visits to flowers far removed from their nests. But researchers from Arizona State University and the Norwegian University of Life Sciences found that aging damages the bees' ability to extinguish the memory of an unsuitable nest site even after the group has settled in a new home. To test how old bees adapt to a changed home location, researchers trained bees to a new nest box while their former nest was closed off. Groups composed of mature and old bees were given several days in which to learn the new home location and to extinguish the bees' memory of their unusable former nest box. The scientists then tore down the bees' new home and forced groups of mixed-age bees to choose between three alternative nest locations, including the former nest box. Old bees began flying toward the former nest site, despite the experience that should have told them that it was unusable. "Although many old bees fail in learning tasks, we also discovered that a few still perform with excellence," explains Daniel Minch, lead author of the study and a senior life sciences researcher in Norway. The scientists believe that their findings with bees offer a new means to model and understand the variability found in brain function between individuals, where some individuals' memories remain complete, while others' learning behavior becomes inflexible with age. Question: Judging from the test ,which of the following is true? - All old bees began flying toward the former nest site. - Bees are more expert in finding a new home with age. - The test result offers a new means to understand the variability in brain function between individuals. - The bees' ability to extinguish the memory of an unusable former nest site was damaged by the test.
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The test result offers a new means to understand the variability in brain function between individuals.

Ques: Read the following article and select the best answer. Article: Mistrust _ Zhengzhou Ride-share Effort More than 300 private car owners from a central Chinese city volunteered to offer free rides to citizens to ease crowded public transportation, but many local people didn't accept the offer for fear of being cheated. The ride-share program was begun in October in Zhengzhou, capital of Henan Province, when Ye Zhantong, a private car driver, started to gather volunteers to offer the free service. The drivers tied a green silk ribbon on the car to differentiate themselves from unlicensed taxi drivers. But the free rides haven't been popular among the public as increasing reports of dishonesty have dried up many local citizens' trust towards strangers. Ye said some of the volunteers have dropped out after they felt their kind intention was being questioned. Passersby walking in heavy rainfall or passengers who missed a bus would remain silent and walk away when the volunteers would stop and offer a ride. "It's so common that people give us the cold shoulder, and sometimes, take our kindness as ill will," said one of Ye's volunteers, identified as Binge. "Many would even say: 'Let's get out of here quickly to avoid being cheated by him.'" Some commenters on Weibo explained why they hesitated to participate in a ride-share program. "Trusting a stranger might bring huge risks. I can't take the risk," one Internet user wrote. Some said Ye's group wasn't authorized, and cheaters pretending to be kind drivers might volunteer. They suggested traffic authorities issue rules to regulate, protect and promote ride-share programs. Question: Which correctly explains the expression "give sb. the cold shoulder"? - To be unfriendly to sb. . - To help sb. unwillingly. - To sit silently beside sb. . - To try hard to support sb. .
Ans:
To be unfriendly to sb. .