Question

    Whether you’re on a long road trip or stuck in traffic while driving home from work, a low phone battery (电池) could mean disaster for the bored driver. At first, it may seem harmless to plug your phone into your car’s USB port. But unless you’re desperate, charging your phone in your car might be a big mistake.

Why? First, the USB port in your vehicle probably provides less electricity than your phone really needs to charge. As a result, your phone might stop working while it charges, or worse—hardly charge at all.

Brad Nichols, a technician at Staymobile, told Reader’s Digest. “This is mostly due to the fact the phone is using more power than the car charger is supplying it.”

Nichols also says that your phone could receive too much power, especially if you’re using a “Cigarette Lighter” port to charge up. Most Cigarette Lighters can supply up to 10 amps (安培)，while most chargers use one to three amps. A damaged charger can provide inconsistent power to the phone, leading to sudden power increase that could cause damage to the inside parts, or on the rare occasion, destroy it.

Charging your phone while on the road could use up your car’s battery, too. If your engine is off, but you still use the radio—the phone will draw power from your car’s battery as it charges. This usually isn’t a big deal for those who own new cars with healthy batteries Nichols says. But if your car is an older model, you might want to avoid charging your phone through its USB port.

Most importantly, it，s not safe to use your phone while operating a vehicle. “Anytime a person’s hands leave the wheel or eyes leave the road, it becomes very dangerous for them and the other people around them,” Nichols says. Bottom line: Play it safe, and wait until you get home to plug in.

1.What’s the main idea of the text?

A. The bottom line of playing your phone safely.

B. The problem with charging your phone in your car.

C. The danger of operating a vehicle while charging.

D. The best solution to charging your phone outside.

2.What does “it” in paragraph 4 refer to?

A. The phone. B. A damaged charger

C. “Cigarette Lighter” port. D. The inside parts.

3.How many reasons does the author list against charging your phone in your car?

A. 2. B. 3.

C. 4. D. 5.

4.Where is the passage probably taken from?

A. A traffic report. B. A driving guide.

C. A science magazine. D. A text book.

Answer

1.B

2.A

3.C

4.C

【解析】

这是一篇说明文。短文主要介绍了在车里给手机充电所带来的问题。

1.主旨大意题。由第一段“ But unless you’re desperate, charging your phone in your car might be a big mistake.”可知，但除非你走投无路，否则在车里给手机充电可能是个大错误，在通过下文介绍了4个反对在车里给手机充电的理由。所以判断出短文主要在讨论在车里给手机充电所带来的问题。故B选项正确。

2.词义猜测题。由第四段“A damaged charger can provide inconsistent power to the phone, leading to sudden power increase that could cause damage to the inside parts, or on the rare occasion, destroy it.”可知，损坏的充电器可能会给手机提供不稳定的电量，突然增加的电量可能会对手机内部部件造成损坏，或者在极少数情况下会损坏手机。所以第4段中的"it"指的是手机。故A选项正确。

3.细节理解题。由第二段“”First, the USB port in your vehicle probably provides less electricity than your phone really needs to charge.第四段“A damaged charger can provide inconsistent power to the phone, leading to sudden power increase that could cause damage to the inside parts, or on the rare occasion, destroy it.”第五段“Charging your phone while on the road could use up your car’s battery, too.”第六段“Most importantly, it，s not safe to use your phone while operating a vehicle.”可知，首先，你车上的USB接口提供的电力可能比你手机真正需要充电的电力要少。因此，您的手机可能会在充电时停止工作，或者更糟的是几乎不充电。损坏的充电器可能会给手机提供不稳定的电量，突然增加的电量可能会对手机内部部件造成损坏，或者在极少数情况下会损坏手机。在路上给手机充电也会耗尽汽车的电池。重要的是，在操作车辆时使用手机是不安全的。所以短文作者列出了4个反对在车里给手机充电的理由。故C选项正确。

4.推理判断题。通读全文可知，短文告诉读者，除非你走投无路，否则在车里给手机充电可能是个大错误，并介绍了4个反对在车里给手机充电的理由来说明车里给手机充电所带来的问题。所以这篇短文主要在科普一些比较专业的关于车里给手机充电的知识。故判断出短文可能来源于一个科学杂志。故C选项正确。