【原创时文阅读】中考英语外刊阅读提升训练（2）Why do some farts smell and some feel hot?（含答案）

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外刊阅读提升训练2
Why do some farts smell and some feel hot
Explore the fascinating world of bottom burps.
Whether or not farts(屁) smell depends on what you've been eating and whether or not you have an upset tummy(胃). Having a tummy bug(病毒) can change the smell of your poo,especially if you have diarrhoea (runny poo). This is because of the smell of undigested food - and the bugs, too.
When you digest food, your intestines produce gas as part of the normal process of breaking food down. Most gases produced - like carbon dioxide, nitrogen, hydrogen and methane - don't smell a tall. That is why you can fart sometimes and nobody really notices. But there is one gas found in some farts that is rally, really smelly. Its called hydrogen sulfide(硫化氢) and has the nickname "rotten egg gas " because that is exactly what it smells like. This is why sometimes you can do a small fart but everyone has to hold their nose. These smelly farts contain more hydrogen sulfide.
Food and farts
If you eat foods that have a lot of sulfur, your gut will produce more hydrogen sulfide(硫化氢). Some vegetables have a lot of sulfur, such as broccoli, Brussels sprouts, cauliflower, cabbage, kale, turnips and Asian greens. Meat does too. If you eat a big piece of meat, your body can have trouble digesting it all at once. As you digest food, it moves from your stomach into the large intestine or colon. Once the foods with sulfur get there, bugs in your gut break them down and produce the hydrogen sulfide gas. If a lot of it builds up and gets released in a fart, it will be very, very smelly.
So why do farts sometimes feel hot
Farts sometimes feel hot because of the temperature difference between inside your body, which is a very warm 37°C, and the air temperature outside, which is usually cooler. This means that fart gas feels hot as it moves from your large intestine, leaves through the opening in your bottom, called the anus(肛门), and touches the cooler skin. You're not as likely to notice the temperature if farts come out really fast because speedy ones don't have as much contact with your bottom.
There is another reason why farts can feel hot. Sometimes people get a hot or burning feeling in their bottom after they eat really spicy food. This is caused by a food chemical called capsaicin(辣椒素). If you eat food that has chillis or hot spices in it, the capsaicin makes your mouth feel hot. When you eat lots and lots of spicy food, some of the capsaicin travels all the way to your large intestine and gets passed out in your poo. The capsaicin then gives you a hot feeling in your bottom when you go to the toilet. There action is the same as that burning feeling in your mouth after eating spicy food, except it happens at the other end.
Fart-proof undies
Researchers did some experiments to test whether they could catch fart smells by getting people to wear special undies that can absorb hydrogen sulfide gas - and the experiments worked! Now, a company based in Leicestershire, England,makes and sells these undies to help people who have gut problems. The company, called Shreddies, says it wants to help people "fart with confidence”.
What is the primary factor that determines whether a fart smells
A. The amount of gas produced.
B. The presence of hydrogen sulfide.
C. The speed at which the gas is released.
D. The individual's overall health.
Which of the following foods can contribute to the production of smelly farts
A. Apples. B. Broccoli. C. Rice. D. Water.
Why do farts sometimes feel hot
A. Due to the temperature inside the body.
B. Because of the speed of the gas release.
C. As a result of the food's spiciness.
D. Both A and C.
What is the main purpose of the "fart-proof undies" mentioned in the text
A. To absorb hydrogen sulfide gas.
B. To provide comfort during digestion.
C. To reduce the speed of gas release.
D. To minimize the noise of放屁 (farting).
知识清单
1.单词积累
*depends on 取决于
*undigested adj. 未经消化的
*intestines肠道
*normal adj.正常的
*process n.过程 v.处理
*break down 分解
*contain v.包含
*have trouble (in) doing sth. 做某事有困难
*Produce v.产生
*builds up 积聚
*Release 释放
*smelly adj.臭
*Temperature n.温度
*difference n. 差异
*bottom n.屁股
*notice v. 注意
*Likely adj.可能的
*Speedy adj.快速的
*contact with 与...接触
*burning feeling 灼烧感
*Spicy adj.辛辣的
*Confidence n.自信
2.长难句：
"Whether or not farts smell depends on what you've been eating and whether or not you have an upset tummy."
- 屁是否臭取决于你吃了什么，以及你的胃是否不舒服。
"Farts sometimes feel hot because of the temperature difference between inside your body, which is a very warm 37°C, and the air temperature outside, which is usually cooler."
- 放屁有时感觉热是因为你体内温度和你体外的空气温度之间的差异。
"The capsaicin then gives you a hot feeling in your bottom when you go to the toilet."
- 当你上厕所时，辣椒素会让你的屁股有一种热的感觉。
But there is one gas found in some farts that is rally, really smelly. Its called hydrogen sulfide and has the nickname "rotten egg gas " because that is exactly what it smells like.
- 但是在一些屁中发现了一种非常难闻的气体。它被称为硫化氢，绰号“臭鸡蛋气”，因为这正是它的气味。
答案详解：
答案： B（细节理解题）
根据文章中的描述，大多数由肠道产生的气体，如二氧化碳、氮气、氢气和甲烷，是没有气味的。然而，一些屁中含有一种非常臭的气体——硫化氢，这就是为什么有时即使放屁不多，但周围的人都需要捂住鼻子的原因。
答案：B （推理判断题）
文章中提到，如果你吃了很多含硫的食物，你的肠道会产生更多的硫化氢。一些蔬菜，如西兰花（broccoli）、甘蓝芽、花椰菜、卷心菜、羽衣甘蓝、萝卜和亚洲绿叶蔬菜含有大量的硫。
答案： D（细节理解题）
文章中解释了两个原因：一是身体内部的温度（大约37°C）与外部空气温度的差异，导致气体在从大肠通过肛门排出并接触到较凉的皮肤时感觉热；二是吃了辛辣食物后，辣椒中的辣椒素（capsaicin）会引起热或灼热的感觉。
答案： A. （主旨大意题）
文章最后一段提到，研究人员进行了实验，通过让人们穿特殊的内裤来测试是否能够吸收硫化氢气体，并且实验成功了。一家位于英格兰莱斯特郡的公司制造并销售这些内裤，以帮助那些有肠道问题的人。公司名为Shreddies，表示希望帮助人们“自信地放屁”。
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