B
What weighs 3500 pounds(1600kg)and lived 60
million years ago?Are you thinking of
dinosaurs?Guess again!You don,t have to go
to a museum to see these creatures.They are alive
and swimming in the warm coastal waters of
Florida.
Manatees(海牛)have lived a peaceful existence in the warm
waters of Florida for 60
million years.However,they are now an endangered species.This means that if humans don,t do
something to save them,they will soon go the way of
dinosaurs.
Humans have made life very difficult for
manatees.One big
danger that humans have
introduced is the speedboat.Because manatees are mammals.they need to come to the
surface to breathe about every 5 to 6 minutes.This means that they are in constant danger of
being caught in the propellers(螺旋桨)of speedboats.And boating aceidents are the greatest cause of death for them.
Manatees are in extra danger when they are
in their sleeping or“torpor”state.They still
have to come to the surface for the air,but sometimes they are too
sleepy to avoid the danger of approaching boats.
Another danger for manatees is the
pollution that humans produce.Due to human pollution,
a deadly plant called red tide had
increased greatly in the Gulf of Mexico.The plant,or algae,
t11riVes(繁茂)on pollution.It wiped out nearly 20 percent of the total
manatee population on
earth.
Humans can help to save manatees。The government has established
boating speed limits to
give the manatees.a chance to escape approaching
speedlsoats.Everyone
can help by cutting
down on waste and pollution to protect the
waters for the manatees.
One famous singer,Jimmy Buffet,has helped save the manatees.He co-founded the Save the
Manatee Club(SMC).SMC
had begun an adoption(收养)program for the manatees.For a fee,sponsors(资助者)can name a manatee.Donations are used to help protect the manatees and their habitat.
45.The manatee is the kind of animal that___________.
A.1ikes living in the cold waters of
Florida B.will die out if not protected in time
C.call dive in the deep sea for
hours D.is the biggest living animal on
earth
46.Why is it dangerous for manatees to be in a torpor state?
A.Because they come to the snlface to breathe,and that is when they are
hunted.
B.Because they eat deadly algae,and this makes them too sick to avoid danger.
C.Because they live in groups and therefore they are easily hurt by
passing boats.
D.Because they are sleepy when they surface,so they can,t avoid approaching
boats.
47.The death of the manatees is largely due to__________.
A.human
hunting
B.human pollution
C.speedboat
accidents D.deadly plants
48.To help protect manatees,people should_________.
A.never go speed boating in their living habitat
B.keep the waters of Florida free from pollution
C.have manatess named by sponsors without a fee
D.wake manatees up from their torpor state