某地蔬菜之家联合社,组织300多户社员办蔬菜专业合作社,形成了“联合社十合作社十社员”的生产组织体系,通过联合社推广良种良法,对蔬菜生产全程植保服务管理,实现以组织化、标准化保障蔬菜品质的封闭生产模式。这种生产模式有利于 ①缩短蔬菜生产周期 ②保障蔬菜优质安全 ③提高农户竞争能力 ④调整蔬菜种植结构 A.①② B.②③ C.③④ D.①④Sharks have lived in the oceans for over 450 million
years, long before dinosaurs appeared. There are now about 360 species of
sharks, whose size, behavior, and other characteristics differ widely.
Every year, we catch and kill over 100 million sharks,
mostly for food and for their fins. Dried shark fins are used to make shark fin
soup, which sells for as much as $50 a bowl in fine Hong Kong restaurants.
Other sharks are killed for sport and out of fear. Sharks are vulnerable(易受伤的) to overfishing because it takes most species 10 to
15 years to begin reproducing and they produce only a few offspring(后代).
Influenced by movies and popular novels, most people
see sharks as people-eating monsters. This is far from the truth. Every year, a
few types of shark injure about 100 people worldwide and kill about 25. Most
attacks are by great white sharks, which often feed on sea lions and other
marine(海洋的) mammals. They sometimes mistake human
swimmers for their normal prey, especially if they are wearing black wet suits.
If you are a typical ocean-goer, your chances of being
killed by an unprovoked(非受挑衅而发生的)attack by a shark are about 1 in 100
million. You are more likely to be killed by a pig than a shark and thousands
of times more likely to get killed when you drive a car.
Sharks help save human lives. In addition to providing
people with food, they are helping us learn how to fight cancer, bacteria, and
viruses. Sharks are very healthy and have aging processes similar to ours.
Their highly effective immune system allows wounds to heal quickly without
becoming infected, and their blood is being studied in connection with AIDS
research.
Sharks are among the few animals in the world that
almost never get cancer and eye cataracts(白内障).
Understanding why can help us improve human health. Chemicals taken from shark
cartilage(软骨)have killed cancerous tumors in laboratory
animals, research that someday could help prolong your life.
Sharks are needed in the world’s ocean ecosystems.
Although they don’t need us, we need them. We are much more dangerous to sharks
than they are to us. For every shark that bites a person, we kill one million
sharks.
1.Which of the following is NOT a reason why people kill
sharks?
A.People kill
sharks for food.
B.People kill
sharks for sport.
C.People kill
sharks out of fear.
D.People kill
sharks because they often attack swimmers.
2.According to the passage, which of the following
statements is NOT true?
A.There are
many different species of sharks, but only a few of them are dangerous to
humans.
B.Sharks never
get ill.
C.Sharks are a
valuable resource for human.
D.Sharks play
an important role in the ocean ecosystem.
3.It can be inferred from the passage that _______.
A.movies have
given people the wrong impression of sharks
B.most sharks
are dangerous to humans
C.sharks will
attack anyone who is wearing black
D.it is
dangerous to swim in the ocean
4.The underlined word “prolong” in the last but one paragraph
means ______.
A.save B.protect C.lengthen D.improve
5.The best title for the passage would be _______.
A.Are Sharks
Dangerous? B.Sharks And
Humans
C.Sharks:
Humans’ Friends D.Sharks Help
Save Human Lives