A. the author preferred other subjects to math

　　B. Mr. Myrus thought it was very easy to learn math

　　C. the author was ashamed to admit his math was poor

　　D. Mr. Myrus helped the author build up his confidence

　　第二节 【广西桂林市桂林中学2017届高三8月月考】根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　　The Science of Risk-Seeking

　　Sometimes we decide that a little unnecessary danger is worth it because when we weigh the risk and the reward, the risk seems worth tasking. ____ Some of us enjoy activities that would surprise and scare the rest of us. Why? Experts say it may have to do with how our brains work.

　　The reason why any of us take any risks at all might have to do with early humans. Risk-takers were better at hunting, fighting, or exploring. __42__ As the quality of Risk-taking was passed from on ration to the next, humans ended up with a sense of adventure and a tolerance for risk.

　　So why aren’t we all jumping out of airplanes then? Well, even 200,000 years ago, too much risk-taking could get one killed. A few daring survived, though, along with a few stay-in-the-cave types. As a result, humans developed a range of character types that still exists today. So maybe you love car racing, or maybe you hate it. __43__

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