[单项选择]Grounded whales often struggle fruitlessly to reenter deep water.
A. violently
B. probably
C. in vain
D. at length

[单项选择]Grounded whales often struggle fruitlessly to reenter deep water.
A. violently
B. probably
C. in vain
D. at length

[单项选择]Grounded whales often struggle {{U}}fruitlessly{{/U}} to reenter deep water.
A. violently
B. desperately
C. in vain
D. at length

[单项选择]Whales live on （）
A. tiny plants and animals in the sea
B. the grassy slopes of northern Canada
C. their young in cold winter
D. the abundant seafood in tropic waters

[单项选择]

Passage Five
Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico.
Eleven gray whales have died in the San Francisco Bay in the last three weeks. No one knows why the whales are dying.
Last year 270 whales died along the whales’ migration route. Many people think starvation is the cause. This year the dead whales seem to have more blubber (fat) on them.
Twenty years ago, the gray whale was listed as an endangered species.
Some scientists think that the larger number of whales makes it hard to find enough food. More whales create more pressure on the food supply, a supply that some scientists say may have dwindled as a result of the warm waters of E1 Nino.
Most of the whales have been dead for many days before they are found and studied. This makes it hard to find the reason for death.
65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year
A. the whales travel such a long distance
B. there are more whales than there used to be
C. the whale bodies are too old to study by the time they are found
D. the whales are endangered

[单项选择]Which of the following is true of whales

[单项选择]According to the news, how many pilot whales eventually died before they were rescued


A. 15.
B. 7.
C. 8.
D. 6.

[单项选择]The loss of one or two northern fight whales every year is considered an unaeeeptable loss because they ______.
A. are the only Whales that can sing songs
B. are the only whales capable of masking the clamour of ocean noise
C. provide clues to scientists to study sea currents and waves
D. are on the very verge of distinction

[单项选择]

Passage Three
All whales fall into two groups, those with teeth and those without. Both beluga and dolphin belong to the suborder of toothed whales known as Odontoceti, along with porpoises, narwhals, pilot whales, killer whales and the largest toothed creature in the world, the sperm whale. Size differences among the Odontoceti are remarkable. A common porpoise will run only 4 or 5 feet in length and 300 pounds in weight; a sperm whale may be 10 times as long and 300 times as heavy. The beluga falls in between, weighing up to 2,000 pounds. And it does chirp. In fact, it makes a great variety of squeaking, whistling, and clicking sounds, which have earned it the name of sea canary.
The toothless, or baleen, whales belong to the suborder of Mysticeti. This is a group of generally large whales, formerly abundant in all the oceans of the world. Though reduced by hunting, most species are still found along the coasts of the United Stated and Canada. All but two
A. Increased pollution of the seas.
B. Hunting.
C. Insufficient supply of food.
D. Disease.

[单项选择]Why might the increasing number of whales cause problems with their health

[单项选择]All of the following whales belong to the suborder of Odontoceti EXCEPT ______.
A. narwhals
B. dolphins
C. blue whales
D. pilot whales

[单项选择]（　）whales can weigh 40 tons and reach lengths of 50 feet.
A. Fully grown
B. Full grown
C. Grown fully
D. Growing fully