B
What is the dirtiest thing in our home? The toilet? Wrong! Scientists in the US have found that electronic devices are even dirtier.
The scientists took samples from 38 electronic devices and other things like toilet seats. They then counted the bacteria colonies (细菌菌落) — groups of bacteria that grow together.
The dirtiest of all turned out to be headphones (耳机). The scientists found 1,073 colonies on the headphones of an average person. That is twice as many as a toilet seat with 425 colonies on average. The sweat and heat from our ears and heads may be the reason. They make a nice environment for bacteria to grow.
Smartphones are quite clean among the devices we often use. Each has only about 187 colonies, but we also touch smartphones the most. When we eat or sleep, we often put them right by our side, so the chance of catching bacteria from them is big.
Some bacteria, like pseudomonas (假单胞菌), can make us very sick. The scientists found them on headphones and computer mice. “They can cause pimples (粉刺) and serious problems for our eyes, ears and lungs (肺),” said the Cleveland Clinic in the US.
So, we should clean our electronic devices often after we finish using them. It is also important to wash our hands before eating and keep our devices away from the dining table.
(
A. Headphones have 425 colonies on average.
B. Bacteria usually grow together in colonies.
C. Headphones are the dirtiest electronic devices.
D. Electronic devices are not as dirty as people thought.
(
A. Because people use them very often.
B. Because people never clean them after use.
C. Because they have the largest bacteria colonies.
D. Because they offer a nice place for bacteria to grow.
(
A. other electronic devices with bacteria
B. the serious problems of using smartphones
C. the bacteria that can live in human bodies
D. the dangers of some bacteria on electronic devices
(
A. By cleaning the electronic devices often.
B. By washing our hands before touching them.
C. By turning them off during eating or sleeping.
D. By putting them on the table while using them.
What is the dirtiest thing in our home? The toilet? Wrong! Scientists in the US have found that electronic devices are even dirtier.
The scientists took samples from 38 electronic devices and other things like toilet seats. They then counted the bacteria colonies (细菌菌落) — groups of bacteria that grow together.
The dirtiest of all turned out to be headphones (耳机). The scientists found 1,073 colonies on the headphones of an average person. That is twice as many as a toilet seat with 425 colonies on average. The sweat and heat from our ears and heads may be the reason. They make a nice environment for bacteria to grow.
Smartphones are quite clean among the devices we often use. Each has only about 187 colonies, but we also touch smartphones the most. When we eat or sleep, we often put them right by our side, so the chance of catching bacteria from them is big.
Some bacteria, like pseudomonas (假单胞菌), can make us very sick. The scientists found them on headphones and computer mice. “They can cause pimples (粉刺) and serious problems for our eyes, ears and lungs (肺),” said the Cleveland Clinic in the US.
So, we should clean our electronic devices often after we finish using them. It is also important to wash our hands before eating and keep our devices away from the dining table.
(
C
) 5. What did the scientists find from their research?A. Headphones have 425 colonies on average.
B. Bacteria usually grow together in colonies.
C. Headphones are the dirtiest electronic devices.
D. Electronic devices are not as dirty as people thought.
(
A
) 6. Why could it be easy to catch bacteria from smartphones?A. Because people use them very often.
B. Because people never clean them after use.
C. Because they have the largest bacteria colonies.
D. Because they offer a nice place for bacteria to grow.
(
D
) 7. Paragraph 5 mainly talks about .A. other electronic devices with bacteria
B. the serious problems of using smartphones
C. the bacteria that can live in human bodies
D. the dangers of some bacteria on electronic devices
(
A
) 8. How can we protect ourselves from the bacteria on electronic devices according to the passage?A. By cleaning the electronic devices often.
B. By washing our hands before touching them.
C. By turning them off during eating or sleeping.
D. By putting them on the table while using them.
答案：5.C 6.A 7.D 8.A
解析：
5. 第三段第一句“The dirtiest of all turned out to be headphones.”表明耳机是最脏的电子设备，C正确。A项耳机平均菌落数是1073，不是425；B项是对“bacteria colonies”的解释，不是研究发现；D项与第一段“electronic devices are even dirtier”不符。
6. 第四段“we also touch smartphones the most... the chance of catching bacteria from them is big”说明因为使用频繁，A正确。B项“never clean”文中未提；C项智能手机菌落数少；D项耳机因汗水和热量适合细菌生长，不是手机。
7. 第五段提到“Some bacteria... can make us very sick... cause pimples and serious problems”，主要讲电子设备上某些细菌的危害，D正确。A、B、C均未准确概括段落主旨。
8. 最后一段“So, we should clean our electronic devices often”，A正确。B项是“before eating”洗手；C项“turn off”文中未提；D项“put on the table”错误，应远离餐桌。
翻译:
B
我们家里最脏的东西是什么？是马桶吗？错！美国的科学家发现电子设备甚至更脏。
科学家们从38个电子设备和像马桶座圈之类的其他东西上采集了样本。然后他们统计了细菌菌落——也就是聚集生长的细菌群。
结果发现所有东西中最脏的是耳机。科学家们发现，普通人的耳机上有1073个菌落。这是马桶座圈平均菌落数（425个）的两倍。我们的耳朵和头部的汗水和热量可能是原因。它们为细菌生长创造了良好的环境。
在我们经常使用的设备中，智能手机相对比较干净。每个智能手机上只有大约187个菌落，但我们触摸智能手机的次数也是最多的。当我们吃饭或睡觉时，我们经常把它们放在身边，所以从它们上面沾染细菌的可能性很大。
一些细菌，比如假单胞菌，会让我们病得很重。科学家们在耳机和电脑鼠标上发现了它们。“它们会导致粉刺，并给我们的眼睛、耳朵和肺部带来严重问题，”美国克利夫兰诊所表示。
所以，我们在使用完电子设备后应该经常清洁它们。吃饭前洗手并让设备远离餐桌也很重要。
5. 科学家们从他们的研究中发现了什么？
A. 耳机平均有425个菌落。
B. 细菌通常聚集生长形成菌落。
C. 耳机是最脏的电子设备。
D. 电子设备没有人们想象的那么脏。
6. 为什么从智能手机上沾染细菌很容易？
A. 因为人们使用它们的频率很高。
B. 因为人们使用后从不清洁它们。
C. 因为它们的细菌菌落最大。
D. 因为它们为细菌生长提供了良好的场所。
7. 第5段主要讲了__________。
A. 其他带有细菌的电子设备
B. 使用智能手机的严重问题
C. 能在人体内生存的细菌
D. 电子设备上一些细菌的危害
8. 根据文章，我们如何保护自己免受电子设备上细菌的侵害？
A. 经常清洁电子设备。
B. 触摸它们之前洗手。
C. 吃饭或睡觉时关掉它们。
D. 使用时把它们放在桌子上。
6. 第四段“we also touch smartphones the most... the chance of catching bacteria from them is big”说明因为使用频繁，A正确。B项“never clean”文中未提；C项智能手机菌落数少；D项耳机因汗水和热量适合细菌生长，不是手机。
7. 第五段提到“Some bacteria... can make us very sick... cause pimples and serious problems”，主要讲电子设备上某些细菌的危害，D正确。A、B、C均未准确概括段落主旨。
8. 最后一段“So, we should clean our electronic devices often”，A正确。B项是“before eating”洗手；C项“turn off”文中未提；D项“put on the table”错误，应远离餐桌。
翻译:
B
我们家里最脏的东西是什么？是马桶吗？错！美国的科学家发现电子设备甚至更脏。
科学家们从38个电子设备和像马桶座圈之类的其他东西上采集了样本。然后他们统计了细菌菌落——也就是聚集生长的细菌群。
结果发现所有东西中最脏的是耳机。科学家们发现，普通人的耳机上有1073个菌落。这是马桶座圈平均菌落数（425个）的两倍。我们的耳朵和头部的汗水和热量可能是原因。它们为细菌生长创造了良好的环境。
在我们经常使用的设备中，智能手机相对比较干净。每个智能手机上只有大约187个菌落，但我们触摸智能手机的次数也是最多的。当我们吃饭或睡觉时，我们经常把它们放在身边，所以从它们上面沾染细菌的可能性很大。
一些细菌，比如假单胞菌，会让我们病得很重。科学家们在耳机和电脑鼠标上发现了它们。“它们会导致粉刺，并给我们的眼睛、耳朵和肺部带来严重问题，”美国克利夫兰诊所表示。
所以，我们在使用完电子设备后应该经常清洁它们。吃饭前洗手并让设备远离餐桌也很重要。
5. 科学家们从他们的研究中发现了什么？
A. 耳机平均有425个菌落。
B. 细菌通常聚集生长形成菌落。
C. 耳机是最脏的电子设备。
D. 电子设备没有人们想象的那么脏。
6. 为什么从智能手机上沾染细菌很容易？
A. 因为人们使用它们的频率很高。
B. 因为人们使用后从不清洁它们。
C. 因为它们的细菌菌落最大。
D. 因为它们为细菌生长提供了良好的场所。
7. 第5段主要讲了__________。
A. 其他带有细菌的电子设备
B. 使用智能手机的严重问题
C. 能在人体内生存的细菌
D. 电子设备上一些细菌的危害
8. 根据文章，我们如何保护自己免受电子设备上细菌的侵害？
A. 经常清洁电子设备。
B. 触摸它们之前洗手。
C. 吃饭或睡觉时关掉它们。
D. 使用时把它们放在桌子上。