According to the article, what changes did the Commercial Revolution bring about？
A. Methods of production.
B. Appearance of craft guilds.
C. Increased trade volume.
D. Growth of trade, banking and methods of productioa
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What is the policy adopted by many schools after heated debating？
A. It is for the universities to clamp down on speech concerning racist comments or other forms of inappropriate ideas.
B. It is to teach students to learn how to express themselves more clearly.
C. It is to give the minority groups/he right to speak freely.
D. It is to urge students to discuss problems concerning race, religion, national origin and ethnicity.
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
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.
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