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Watch a movie clip and fill in the missing words: the day after tomorrow.rmvb Script of clip from the day after tomorrow Jack : The 1) ___________ of these natural greenhouse gases in the ice cores 2) ___________ that runaway warming pushed the planet into an ice age which lasted two centuries. A: I'm confused. I thought you were talking about global warming, not an ice age. Jack : Yes, it is a 3) ___________, but global warming can 4) ___________ a cooling trend. Let me explain. The Northern Hemisphere owes its typical climate to the North Atlantic Current. Heat from the sun arrives at the equator and is carried north by the ocean. But global warming is 5) ___________ the polar ice caps and 6) ___________ this flow. Eventually it will shut down. And when that occurs there goes our warm climate. B : Excuse me. When do you think this could happen, professor? When? Jack : I don't know. Maybe in 100 years, maybe in 1000. But what I do know is that if we do not act soon, it is our children and grandchildren who will have to 7) ___________. VP : And who's going to 7) ___________ of the Kyoto Accord? It would cost the world's economy hundreds of billions of dollars. Jack : 8) ___________, Mr. Vice President, the cost of doing nothing could be even higher. Our climate is 9) ___________. At the rate we're burning fossil fuels and polluting the environment, the ice caps will soon disappear. VP : Professor Hall, our economy is every bit as 9) ___________ as the environment. Perhaps you should keep that in mind before making sensationalist claims. Jack : Well, the last chunk of ice that broke off was about the size of the state of Rhode Island. Some people might call that pretty 10) ___________. Stop global warming! Stop global warming! I'm at the Global Warming Conference in New Delhi where, if you can believe it, it's snowing.
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【简答题】串行通信的通信方式和特点有(    ); 并行通信的通信方式和特点有(    )。 A.各位同时传送;    B.各位依次逐位传送; C.传送速度相对慢;    D.传送速度相对快; E.便于长距离传送;    F.不便于长距离传送;
【简答题】移动通信的工作方式有:()方式、半双工方式和()方式。
【简答题】目前常用的高级通信方式有______、______和______。
【简答题】异步通信的通信方式和特点有(    ); 同步通信的通信方式和特点有(    )。 A.依靠同步字符保持通信同步;    B.依靠起始位、停止位保持通信同步; C.传送速度相对慢;    D.传送速度相对快; E.对硬件要求较低;    F.对硬件要求较高;
【简答题】通信线路的通信方式有单工通信、______和______。
【简答题】现代通信方式有______通信、卫星通信、光纤通信、______通信四种方式.
【简答题】串行通信的传送方式有______、______和______。
【简答题】在无线通信系统中,同频单工通信方式和异频双工通信方式有何不同?
【单选题】移动通信的工作方式可分为单向通信方式和双向通信方式两大类别,而后者有()方式。
A.
单工通信方式
B.
双工通信方式
C.
半双工通信
D.
以上都对
【单选题】关于P型.N型半导体内参与电的粒子,下列说法正确的是()
A.
无论是P型还是N型半导体,参与导电的都是自由电子和空穴
B.
P型半导体中只有空穴导电
C.
N型半导体中只有自由电子参与导电
D.
在半导体中有自由电子.空穴.离子参与导电
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