Directions： Read the following passages carefully. Each passage is followed by some questions or unfinished sentences. For each of them there are four choices marked A, B, C, and D. Choose the best answer to each question.Mothers have known it for years. Give the children a hamburger, and they will love it; spend hours making a home-cooked meal, and they will leave it on the plate. Now French scientists have discovered why. According to researchers near Paris, the brain does not respond well to unfamiliar tastes. Sensations are not as strong when the mind is struggling to understand messages that come from the tongue. This provides little reason to taste new things. Human beings are naturally like rats – we are afraid of anything new. If you give rats some food that they have never had before, they will turn their backs on it out of fear. We are the same. It is possible to introduce new foods, but only in the right psychological context, like a birthday. Once the introduction has been made, the fact of having a full stomach is physically pleasing, so the next time it is easier. However, some foods are more tempting than others. Scientists are sure that we are born with a sweet tooth. This is why children have a natural desire for sugar. Another discovery is how a sense of smell affects our appetite. In one experiment, chemical substances were put on the tongues of human participants. At the same time, air was blown down the participants’ noses so they could not smell the chemical substances. As a result, no two people got the same sensation from the same food. Physical, psychological, and cultural differences shaped the response. The intensity of feelings about food depends upon knowledge of it. The average student who eats a new dish will have only a cloudy image of it, but for some people whose tongues are trained to appreciate fine differences, they’ll have an exciting experience, much like someone who has a great musical ear. This is why someone who eats hamburgers everyday likes them and becomes a hamburger expert. They can tell the difference between a Big Mac and a Burger King, just like the Japanese can tell the difference between varieties of rice that taste the same to Europeans.(1) (单选题)Why do children prefer a hamburger to a home-cooked meal?A.The person doesn’t get the instruction from the brain.B.The brain doesn’t respond well to unfamiliar tastes. C.The food made at home is not tasty.D.Children prefer food that is easy to make.(2) (单选题)On what occasion are people willing to try new food?A.When they are happy. B.When they are hungry.C.When they have already eaten.D.When they eat with friends.(3) (单选题)What causes people to like certain foods but not others?A.The fact whether they have a sweet tooth.B.The way how the food is cooked.C.The differences in people who eat food. D.The color people see of the food.(4) (单选题)Why can some people appreciate the fine differences in food?A.They like to try different kinds of food.B.They have an ear of music.C.They don’t eat a lot of food.D.They know a lot about food.(5) (单选题) What is an appropriate title for the passage?A.Why People Don’t Like Unfamiliar FoodB.The Brain That Plays a Role in Our Eating HabitC.The Factors That Affect People’s Eating Habit D.The Reasons Why People Can Tell Differences in Food