皮皮学,免费搜题
登录
搜题
【简答题】
What does fizz (气泡) taste like? In Bubbly (多泡的)drinks such as sodas, tiny bubbles give the drink a lift--- and have a distinct taste, In a new study on mice, scientists have connected that fizzy-taste feeling to the ability to taste sourness, such as that of oranges or vinegar. Scientists first thought the taste of bubbles came from the bubbles bursting on the tongue, but now ate starting to think differently. Charles Zuker, of Columbia University, and his team studied the nervous system of mice to understand how the tongue tastes carbon dioxide, which is the gas that makes up the bubbles. Animals, including human beings, are able to detect different tastes by using taste buds(味蕾) which pick up tastes in the mouth, and then send them to the brain. In the experiment, different groups of mice were genetically engineered to be missing one of the senses involved in taste. “Genetically engineered” means the researchers were able to turn off the switches for certain senses by changing the genes responsible for taste. The mice in one group could not taste sweet; another, sour; the third, bitter, and the fourth, salt. When the scientists gave carbon dioxide to the mice, the nervous systems of all the mice responded to the gas, except those of the mice that could not taste sour. This shows that the taste of the bubbles must be sour, and that by turning off the ability of the mice to taste sour, the scientists also turned off their ability to taste carbon dioxide. When they studied the cells that detect sourness, the researchers found a protein attached to the cells that is important to the process of tasting carbon dioxide. When carbon dioxide comes into contact with this protein, the protein knocks off particles called protons. These protons(质子), in turn, travel to the brain, which says ,” Hey! That’s a taste!” It may seem like a lot of work to get from a can of soda to a taste, but the science of the senses is anything but simple, “  Taste is a challenging system to study,” one researcher says. 小题1: What is the most important function of the bubbles? A.To look interesting . B.To make drinks taste good. C.To make drinks funny. D.To produce a lot of fizz. 小题2:From the experiment the researchers learned that______. A.sourness has nothing to do with the taste of bubbles. B.there is a connection between sourness and bubbles. C.the taste of bubbles is better if it’s less sour. D.most mice cannot taste carbon dioxide. 小题3: It can be inferred from the passage that ________. A.the taste of bubbles is produced by the bubbles bursting on the tongue. B.the nervous systems of mice show how the tongue tastes carbon dioxide. C.taste seems simple but is very complex to research. D.nerve cells sending signals to the brain is the first step in tasting something. 小题4: Which of the following would be the best title for the passage? A.Nervous Systems Understand How the Tongue Tastes. B.The Process of Taste C.The taste of Bubbles. D.Different Animals Detect Different Tastes.
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【简答题】创作一副植物简笔画组合形象,要求易识别,形象生动,构图完整,适当设色
【单选题】导游着装应注重服装色彩的搭配。一般来说,()是服饰搭配最常见的三种颜色,它们最容易与其他颜色的服装搭配并产生良好的视觉效果。
A.
黑、黄、白
B.
黑、灰、白
C.
黑、蓝、白
D.
黑、清、白
【单选题】臭氧层是地球上所有生物的保护伞,它能吸收太阳光中过量的对生物有害的光线.你知道是什么光线吗
A.
红外线
B.
紫外线
C.
伽玛射线
D.
电磁辐射
【单选题】中职生应该按 的标准,完成在中等职业学校的学习任务。
A.
“两种证书”
B.
职业资格证书
C.
“一种证书”
D.
中职学历
【简答题】300nm的紫外线能否断裂C-H键(已知C-H的键能为344.8KJ/mol)?为什么说臭氧层是地球的“保护伞”?
【单选题】以下关于宏的叙述中,错误的是
A.
宏是Access的数据库对象之一
B.
可以将宏对象转换为VBA程序
C.
不能在VBA程序中调用宏
D.
宏比VBA程序更安全
【单选题】地球的保护伞是什么
A.
平流层
B.
对流层
C.
臭氧层
D.
中间层
【简答题】10dBm+10dB=()dBm。
【单选题】导游着装应注重服装色彩的搭配。一般来说,( )是服饰搭配最常见的三 种颜色,它们最容易与其他颜色的服装搭配并产生良好的视觉效果
A.
黑、黄、白
B.
黑、灰、白
C.
黑、蓝、白
D.
黑、青、白
【简答题】试比较10dBm、10W及10dB之间的差别。
相关题目: