ieee最初制定的无线局域网标准是ieee802.1。()
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The word "unwarranted"(line 3, para. 2)most probably means "______".
A. undeserved
B. unnecessary
C. extreme
D. unfair
Which of the following titles is most appropriate to the text？
A. The Failed Search for an Earthquake Prediction System
B. The Merits of Trying to Predict Earthquakes
C. The Debate over Earthquake Prediction Systems
D. The Drawbacks of Earthquake Prediction Systems
Which of the following would be the best title of the text？
A. Personalities of animals
B. The different courtship behaviors of birds
C. How birds react to predators
D. A study on birds" behaviors
According to Paragraph 1, which of the following is true about the study？
A. It chose different types of birds as subject.
B. It put one female bird in a box while putting males on top of it.
C. It proved that all animals show some kind of personalities.
D. A number of experts participated in it.
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