A. To check the arrangement.
B. To exchange ideas.
C. To decide the topics.
D. To ask for leave.
57. Which of the clubs focuses mainly on the basic knowledge of language?
A. English Conversation.
B. French Conversation, Advanced .
C. French Language Lab, Beginner.
D. French Conversation, Advanced Beginner.
B
There is a huge demand for shark fins(鳍) in Asian countries. As a result, revenue annually, or about $1. 9 million during its lifetime. Due to overexploitation and lack of proper management, many shark species are under considerable risk of unrecoverable decline with some species having declined to near extinction in recent years. According to reports, sharks are being killed at an alarming rate of up to 273 million worldwide per year.
Some experts predict that if the killing continues at the current rate many shark species will be lost forever. It can be very dangerous. Sharks are very important and they should be protected.
In a study of the east coast of the United States, 11 species of sharks were eliminated from their range. Of the 14 species of ocean life that those sharks used to eat, the populations of 12 exploded and caused great damage to the ecosystem. For example, the cow nose ray(鳐) population was no longer kept under control by sharks and so grew out of control. As a result, (扇贝), op fishery, which had been in good condition for over 100 years, was wiped out. Also, the removal of the scallops most likely had an effect on water quality as they were no longer there to perform their function of cleaning the water.
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