4．Why is it difficult for scientists to study the hippo?

　　A．It can move fast.

　　B．Its number is decreasing.

　　C．It is the most dangerous animal.

　　D．It doesn't appear on land during the day.

　　答案　D　[推理判断题。由最后一段中的By spending their days in the water and their nights on land，hippos make it difficult for scientists to study them.可知，科学家们对河马的研究比较困难是因为白天他们很难发现河马。]

　　B

　　COOL INVENTIONS

　　For light sleepers

　　Millions of people have trouble falling asleep each night，which is why Light Sleeper was created.

　　Developed in the United Kingdom，LightSleeper's makers say it can help a person fall asleep and also help a person fall back to sleep after waking up in the middle of the night.

　　LightSleeper works by projecting(投射) a light onto the ceiling while the person is lying down.The idea is to watch the light，because the light moving in a circle has a relaxing effect.

　　One of the advantages of the product is that it won't disturb other people in the room.The product can be easily moved and will switch itself off after 30 minutes to save power.

　　Stop the snoring(打鼾)

　　Here's a new product designed to slow down the frequency and level of your snoring.The Snore Stopper has a sensitive instrument that will detect when you're snoring.Once it does that，it will send a very mild electronic signal to your wrist.This consequently changes your sleeping position to stop you from snoring.The Snore Stopper won't cause any damage to your body.

【2017届高考英语牛津译林版选修7总复习限时训练《Unit 1 Living with technology》7-1（江苏专用）】相关文章：

★ 2017届高考英语二轮复习课时训练：13（含解析）

★ 2017届江苏省淮安市新马中学高考牛津译林版英语一轮复习活动单：模块8 Unit 2《The universal language》

★ 2017届高考英语二轮复习书面表达限时测验：5（含解析）

★ 2017届高考英语二轮复习课时训练：5（含解析）

★ 2014年牛津译林版高中英语总复习（第1轮）同步练习 M2《Unit 2　Wish you were here》Word版含解析

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（17）模块6 《Unit 17 Laughter》（含解析） 北师大版必修1

★ 2017届高考英语二轮复习课时训练：7（含解析）

★ 2017届高考英语二轮复习书面表达限时测验：2（含解析）

★ 2014届高考英语一轮复习课时作业(二十六)必修5Module 2《A Job Worth Doing》（外研版）

★ 2014届高考英语一轮复习课时作业(三十)必修5Module 6《Animals in Danger》（外研版）