Ⅰ.阅读理解
Thanks to El Nio, California's coastal waters have become more suitable for fish from the tropics (热带地区) to live.Hammerhead sharks are among them.
“For over a year now, a lot of warm water fish that we don't usually see have been coming up，” said Rick Feeney, fish expert from the Natural History Museum of Los Angeles County.
The arrival of large numbers of big fish like wahoo and tuna has also promoted California's saltwater sport fishing industry, which brings in about D|S1.8 billion a year.
“All the sport fish from Mexico are coming up here.In fact, there are probably more sport fish up here than there are down at the tip of Baja where they usually are.Things like marlin, yellowtail, wahoo, yellow fin tuna, blue fin tuna, all sorts of things that fishermen love to catch，” said Feeney.
But southern California's warmer waters fish are forcing out other species that the local wildlife depends on.
“Fish like anchovies and sardines have moved on.And a lot of baby seals and baby sea lions are starving because the mothers can't find enough food.That might be one of the effects of El Nio，” explained Feeney.
Researchers say the northern migration (迁徙) of fish in the Pacific Ocean has been one of the most dynamic effects of the climate phenomenon.
“Historically, it's a temporary change, and once El Nio stops, the fish just go back to the cold waters.But we all know about global warming, and year by year we don't know how many of these fish will actually stick around and reproduce (繁殖)，” said Fenney.
语篇解读：本文介绍了厄尔尼诺现象造成的鱼类迁徙及其对加州海域食物链的影响。
1．What can be the best title for the text?
A．A Onceinalifetime Big Catch
B．El Nio and the Tropical Fish
C．The Fishing Industry in Baja and California
D．El Nio Brings Unexpected Fish to California
解析：选D 标题归纳题。根据第一段的第一句“由于厄尔尼诺现象，加州海岸水域更加适合暖水区的鱼类生存”和下文所列出的具体的例子可知，本文的最佳标题是“厄尔尼诺给加州带来了意想不到的鱼类”。
2．Which of the following fish are from warm waters?
A．Wahoo and sardines. B．Tuna and anchovies.
C．Hammerhead sharks. D．Marlin and sea lions.
解析：选C 细节理解题。根据文章第一段的第二句话可知，锤头鲨是来自暖水区的鱼。故选C。
3．What do we know about the seals according to Feeney?
A．The baby seals may die of cold.
B．The baby seals may die of hunger.
C．The seals may stop reproducing.
D．The seals may move to the south.
解析：选B 推理判断题。根据第六段的“And a lot of baby seals and baby sea lions are starving because the mothers can't find enough food”可知，小海豹可能会死于饥饿。故选B。
4．We can infer from the passage that ________.
A．the fish have brought a big profit to Mexico
B．the fish experts are happy to see more sport fish
C．the fish will stay off the California coast for many years
D．the fish have affected the food chain off the California coast
解析：选D 推理判断题。根据文章的第五段和第六段可知，南加州暖水区鱼类把本地野生生物所依赖的其他物种排挤了出去。有些动物的幼崽由于没有足够的食物而挨饿，由此可以推测出暖水区鱼类的到来影响了加州海域的食物链。故选D。
