题型 判断 4 配对 6 选择 3
1.The sundials have always been inaccurate to record time in ancient Egypt. (F)
2.The wooden shade clock were the only way to indicate period. (F)
4.Burning powder (NG)
Questions 5-10 Matching
NB: You may use any letter more than once.
B. Wooden shade clock
D. Oil lamp clock
文章题目 Fish communications
Can fish "talk?" And if they do, can other fish hear what they are saying?
The answer to both questions is yes, but fish "talk" and "hear" somewhat differently than humans. Although not extremely common, there are several species of fish that are able to produce sound to communicate with members of their own and other species. Most of the fish that produce sound do it at such low frequencies that divers cannot hear the noises. But several species do produce sound in the range that humans can hear. For example, grunts are able to produce sound by grinding their flat teeth together (hence the name grant!) The large Jewfish, Nassau and Black groupers are known to make very loud "booms" when startled or cornered. Jewfish have also been observed to make these loud sounds during courtship. ..