Read the article and select the best answer. Article: It's a bicyclist's dream: a bike that can't be stolen. The Yerka, designed by three young Chilean engineering students, is the latest entry in a trend of bikes. They use their saddle seat as a lock. They can also use their handlebar as a lock. But the inventors of the Yerka have made an improvement to it. The bike's lower frame opens up into two arms that are then connected to the seat post and locked to a post, so thieves would have to destroy a Yerka to get it unlocked. "That's why our motto is 'A bike that gets stolen is no longer a bike'. What we have here is truly an unstealable bike," said Cristobal Cabello, who came up with the design during a college engineering class with childhood friends Andres Roi Eggers and Juan Jose Monsalve. In Chile and elsewhere in Latin America, the spread of cycling lanes, storage racks and bike share programs are encouraging people to change from cars to bikes , which are cheaper and environmentally friendly. Cristobal Galban said a study by his team in 2013 found that the use of bikes has doubled among Chileans in five years. The main problem in Chile and elsewhere is robberies. The most effective strategy commonly used in London today is to take the bike into the office with the rider. Other strategies involve using a bike that looks so unattractive that nobody will want to steal it. But now the Yerka can help solve the problem. Now, while waiting for the patent to be approved and carrying out more tests the team plans to raise funds. They're also looking for a partner who can invest $300,000 needed to produce 1,000 bikes first that they hope will be sold by mid-2016. Question: According to Cristobal Cabello, it can be inferred that the Yerka _ . Options: A: will be safe if it is fully used B: will be broken if it gets stolen C: will be expensive if it gets repaired D: will not be stolen even if it is unlocked
B

Read the article and select the best answer. Article: Dogs have an understanding of fair play and become angry if they feel that another dog is getting a better deal, a new study has found. The study looked at how dogs react when a companion is rewarded for the same trick in an unequal way. Friederike Range, a researcher at the University of Vienna in Austria, and her colleagues did a series of experiments with dogs who knew how to respond to the command "give the paw ". The dogs were normally happy to repeatedly give the paw, whether they got a reward or not. But that changed if they saw that another dog was being rewarded with a piece of food, while they received nothing. "We found that the dogs hesitated significantly longer when obeying the command to give the paw," the researchers write. The unrewarded dogs eventually stopped cooperating. Scientists have long known that humans pay close attention to inequity. But researchers always assumed that animals didn't share the trait. "The argument was that this is a uniquely human phenomenon," says Frans de Waal, a professor of psychology at Emory University in Atlanta. That changed in 2003 when he and a colleague did a study on monkeys. The monkeys had to hand a small rock to researchers to get a piece of cucumber in return. They were happy to do this. But if they saw that another monkey was getting a more delicious reward, a grape, for doing the same job, they would throw away the food and rock, and at some point just stopped performing. In that experiment, the monkeys considered the fairness of two different types of payment. But when Range and her colleagues did a similar study with their trained dogs, testing to see if dogs would become upset if they only got dark bread when other dogs received sausage, they found that as long as the dogs got some kind of food payment, even if it wasn't the most delicious kind, the animals would play along. Question: Range found that, compared with monkeys, dogs _ . Options: A: care more about whether they are rewarded. B: care less about what they are rewarded with. C: care more about what they are ordered to do. D: care less about who gives them orders.
B

*Question*
Read the article and select the best answer. Article: Bottled water has become the choice for people who are healthy and thirsty. Bottled water is all over the world. But some say the planet's health, and people's health may be suffering from it. The idea that bottled water is safer for humans may not be true. The Natural Resources Defense Council of America said, "There is no promise that because water comes out of a bottle, it is cleaner or safer than water from the tap." Another New York City-based action group added that some bottled water is "really just tap water in a bottle--sometimes more clean, sometimes not." It is not proven that bottled water is better than tap water. Nick Reeves from the Chartered Institution of Water and Environmental Management said, "The high mineral content of some bottled water makes them not good for feeding babies and young children." Also, most bottled water doesn't have fluoride , which can make teeth stronger. Kids are drinking more bottled water and less fluoridated tap water, and some say that's behind the recent rise in bad teeth. Storing is another problem. Placed near heat, the plastic bottles can produce bad chemicals into the water. According to the Environmental Protection Agency, some 2.7 million tons of plastic are used worldwide to bottle water each year. The plastic can take between 400 and 1,000 years to break down. In terms of energy use, plastic bottles are also not cheap. One report said that if water and soft drink bottlers had used 10 percent recycled materials in their plastic bottles, they would have saved about 72 million gallons of gas. So, if you are worried about the effect of bottled water on the Earth, you can take the following steps. *Drink from your tap. Unless your government warns against this, it should be fine. *Get a container . Carry your tap water in a steel or a lined drinking container, and clean it between uses. *Keep it cool. Don't drink from a bottle that has been sitting in the sun, don't store it near chemicals, and don't reuse plastic bottles. *Choose glass containers over... Question: What is the main idea of the article? Options: A: Drinking tap water is the only choice for people. B: Glass containers are better than plastic bottles. C: Plastic bottles are harmful to the environment. D: Bottled water may not be as good as we think.
**Answer**
D