单选题The passage mentions that many people believe that if you don't eat breakfast, you will______.

单选题Why did the girl invite Uncle Smith to dinner?

单选题James Marshall didn't know what had happened to the plane until ______.

单选题Parents are often laughed at by their children when ______.

单选题According to a recent scientific report, human beings are likely to travel ______ the speed of light in near future.

单选题What ______ it is to travel around the world by sea. A. a fun B. pleasure C. fun and a pleasure D. a fun and a pleasure

单选题During its growth, how much of the water from the soil does the tree give off into the air through its leaves?

单选题Whatdoesthewomansuggesttheyshoulddo?

单选题What did the writer do when he walked away from the dry-cleaning store?

单选题"Please ______ why you're so late", said his girlfriend. A. excuse B. explain C. apologize D. tell

单选题 I am 15. Now I'm studying English in London. I want to invent a language machine that can help me understand as many languages as possible. Marie, France I am 13. I dream of going to a top university after I graduate. I want to be a reporter in the future. Michiko, Japan I am a 16 year-old girl in Tibet(西藏). The Qinghai Tibet Railway has been built. I'll be able to reach Beijing by train in about 48 hours. My dream is to go to Beijing to watch the 2008 Olympic Games. Joma, China I am a 12 year-old girl. I like traveling very much. How I wish to visit Egypt someday! Masha, Russia I am 14 years old. I dream of inventing a machine that can send things or people from one place to another in a minute. Andrew, the USA

单选题Wheredoesthisconversationprobablytakeplace?

单选题A computer ______ think for itself. It must be told what to do.

单选题To fight a noise by making more noise sounds strange, but that's exactly what motor engineers are doing in Germany and some other countries. Carmaker's research and development laboratories have already proved that mixing more noise with the help of loudspeakers can reduce the unwanted noise. Physicists have known about the technique for a long time. Sound is made up of pressure waves in the air. If two sound waves of the same frequency (频率) mix so that the highest point of one wave happens at the same time as the lowest point of the other wave, the result is no sound. Therefore, by producing a perfect copy of the noise and delaying it by half a wave cycle (周期), we can kill the unwanted noise. Using this technique many carmakers are racing to develop noise killing systems (系统) both inside and outside the cars. Another good thing about the use of noise killing systems is that it saves the need for a silencer; this not only reduces the weight of a car, but also makes the motor burn less fuel and work better. Some engineers believe that the noise killing system will be used in most cars within a few years. But the carmakers haven' t decided if they will carry it into production because it would add several hundred dollars to the cost of their cars.

单选题From the text we know when bananas are harvested, they are_____________.