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.
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