The passage implies that________.
A. LED bulbs are still expensive at present
B. the task of making LED the main source of artificial light is too difficult
C. LED traffic lights are used everywhere in the world
D. in order to fulfill the task of making LED the main light source, lightbulb makers have to work together with semiconductor manufacturers
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The author implies that villagers liked LED bulbs very much, because they________.
A. were given by Irvine-Halliday
B. are rugged
C. are cheap
D. are easily-recharged
What is mainly discussed in the text？
A. roast bean can cure disease.
B. roast bean is a good medicine.
C. more and more people want to drink coffee.
D. whether the roast bean is good or bad is also a question.
What is the typical scene found in the campus of Wesleyan University？
A. Pieces of chalk are scattered everywhere on the ground.
B. There are some meeting announcements on the billboard.
C. All kinds of messages are written on the paths.
D. Some people are shocked by the meeting announcements.
What worries her recently？
A. She cannot work in London.
B. She cannot live in London.
C. It is difficult for her to finish her studies.
D. It'll be difficult for her to find a job.
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