Ⅰ.阅读理解
More than one billion young people risk damaging their hearing through excessive (过度的) use of smartphones and other audio devices (音频设备), the UN warned Tuesday, proposing new safety standards for safe volume levels.
In order to safeguard hearing, the World Health Organization and International Telecommunications Union issued a voluntary international standard for the manufacture and use of audio devices.
Young people are particularly prone to get risky listening habits. Around half of those between the ages of 12 and 35, or 1.1 billion people, are at risk due to “long exposure to loud sounds, including music they listen to through personal audio devices”， the UN health agency said.
Currently, about five percent of the global population, or some 466 million people, including 34 million children, suffer from disabling hearing loss. WHO considers a volume above 85 decibels (分贝) for eight hours or 100 decibels for 15 minutes as unsafe.
WHO is calling for parental as well as automatic volume controls on audio devices to prevent dangerous use.
While some smartphones and other audio devices already offer some of these features, the UN would like to see a uniform standard used to help protect against disabling hearing loss.
“Think of it like driving on a highway, but without a speedometer (速度计) in your car or a speed limit，” Shelly Chadha of the WHO told reporters in Geneva. “What we've proposed is that your smartphones come fitted with a speedometer, with a measurement system which tells you how much sound you're getting and tells you if you are going over the limit.”
这是一篇说明文。联合国于本周二发出警告，称有超过10亿的年轻人因过度使用智能手机和其他音频设备而面临听力受损的风险。为了保障听力，世界卫生组织和国际电信联盟发布了一项关于制造和使用音频设备的自愿国际标准。其中年轻人特别容易养成冒险的倾听习惯，世卫组织认为8小时内音量超过85分贝或15分钟内音量超过100分贝是不安全的。
1．What does the underlined word “prone” in Paragraph 3 probably mean?
A．Likely. B．Addicted.
C．Willing. D．Expected.
答案：A
解析：词义猜测题。根据下文Around half of those between the ages of 12 and 35, or 1.1 billion people, are at risk due to “long exposure to loud sounds, including music they listen to through personal audio devices”， the UN health agency said.(该联合国卫生机构表示，年龄在12岁至35岁之间的人群中，约有一半，即11亿人，由于“长时间暴露在嘈杂的声音中，包括他们通过个人音频设备收听的音乐”，面临听力丧失的危险。)可知，年轻人更倾向于养成冒险的倾听习惯。故可推测画线单词意思为“很可能；很可能的”。故选A。
2．How do Paragraphs 3 and 4 develop?
A．By making comparisons. B．By offering examples.
C．By analyzing reasons.D．By giving figures.
答案：D
解析：推理判断题。根据第三段中Around half of those between the ages of 12 and 35, or 1.1 billion people, are at risk due to “long exposure to loud sounds, including music they listen to through personal audio devices”， the UN health agency said.(该联合国卫生机构表示，年龄在12岁至35岁之间的人群中，约有一半，即11亿人，由于“长时间暴露在嘈杂的声音中，包括他们通过个人音频设备收听的音乐”，处于听力丧失危险之中。)以及第四段Currently, about five percent of the global population, or some 466 million people, including 34 million children, suffer from disabling hearing loss. WHO considers a volume above 85 decibels (分贝) for eight hours or 100 decibels (分贝) for 15 minutes as unsafe.(目前，全球约5%的人口，即约4.66亿人，包括3 400万儿童，患有致残性听力丧失。世卫组织认为8小时内音量超过85分贝或15分钟内音量超过100分贝是不安全的。)可知，第3和第4段是以列举数字的形式展开的。故选D。
3．Which of the following statements is true according to the passage?
A．Half of 1.1 billion people are getting risky listening habits.
B．About 466 million children are suffering from hearing loss.
C．A volume above 85 decibels for 10 hours or 120 decibels for 15 minutes is unsafe.
D．A uniform standard has been made to help protect against disabling hearing loss.
答案：C
解析：细节理解题。根据第四段最后一句WHO considers a volume above 85 decibels (分贝) for eight hours or 100 decibels for 15 minutes as unsafe.(世卫组织认为8小时内音量超过85分贝或15分钟内音量超过100分贝是不安全的。)可知，音量超过85分贝8小时或100分贝15分钟是不安全的。故C选项正确。
4.Why does the author mention “driving on the highway” in the last paragraph?
A．To indicate it is dangerous to drive on the highway.
B．To suggest a speedometer should be fitted in a car.
C．To show how a smartphone works with a measure system.
D．To emphasize that it is necessary to fit a measure system in smartphones.
答案：D
解析：推理判断题。根据下文What we've proposed is that your smartphones come fitted with a speedometer, with a measurement system which tells you how much sound you're getting and tells you if you are going over the limit.(我们的建议是，你的智能手机应该配备一个速度计，这个测量系统可以告诉你听到了多少声音，并告诉你是否超过了限制。)可知，作者在最后一段提到“driving on the highway”是为了强调有必要在智能手机上安装一个测量系统。故选D。
