Itmayseemsimple-welikechocolatebecauseittastesnice.Butt...

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问题详情：

It may seem simple - we like chocolate because it tastes nice. But there's more to it than that. I love chocolate and once I start on a bar I can't stop until it's all gone.

So what is it about the food that so many of us find irresistible? And what characteristics does chocolate share with other foods that we simply can't say, "no" to?

Chocolate is made from cocoa beans, which have been grown in the Americas for thousands of years. To get at the beans you first have to crack open the thick shell(壳) of the cocoa pod, getting the beans that has an flavor that's halfway between lemonade and a custard apple. After they are dried and roasted for days, the beans will have some special flavors, and the combination of these flavors creates a unique flavor that our brains love.

Chocolate contains a number of interesting psychoactive chemicals. These include anandamide, which gives us "joy". It also contains tyramine and phenylethylamine, both of which have similar effects to amphetamines which helps us reduce some degree of pain. If you look hard enough, you will find caffeine, which are well-known to keep us active when we feel sleepy sometimes.

Well, it also has a feature. When you take it out of its wrapper and put a bit in your mouth without biting, you will notice that it rapidly melts on your tongue, leaving a sensation of smoothness, which then makes the feelings of pleasure. But the thing that really turned the cocoa from a painful drink into the snack we admire today was our natural love of sugar and fat.

29. Which of the following statements is TRUE?

A. People have enjoyed chocolate for thousands of years.

B. Cocoa beans will have some good flavors once cracked from pods.

C. Tyramine in chocolate can help to solve sleep problems.

D. It is sugar and fat that make chocolate attractive to people.

30. Which of the following can show the right structure(结构) of the passage?