According to the scientific study, a shortage of fish and other foods are 1.

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问题 According to the scientific study, a shortage of fish and other foods are 1.______
threatening many of the world’s penguins. As many as ten of the seventeen
kinds of penguins may be in the danger of disappearing. 2._____.
Penguins are black and white birds live in the southern half of the world, 3.______
They are common to South America, New Zealand, Australia and South Africa,
Many live near cold waters. But some live near warm waters in the Galapagos
Islands. Penguins cannot fly. Moreover, they are fine swimmers. Penguins eat 4.______
fish. Some kinds of penguins eat a small shrimp-like crustacean called krill.
Many scientists blame global warming for the increase in penguin populations. 5.______
They believe the heat of the atmosphere has caused ocean waters to become 6.______
warmer and higher water temperatures have reduced the supply of fish and krill.
Rising air and water temperatures may have especially been harmed 7.______
Galapagos penguins. In these years, these birds are completely unable to
produce. In addition, many adult penguins die of hunger. 8.______
Widespread fishing, exploration for oil and oil leaks also threaten
penguins. Poisonous organisms in ocean water are another danger. These
toxic blooms result in changes in the ocean water. Some scientists believe 9. ______
that warming of ocean is responsible.
In 2010, more than half the yellow-eyed penguins in New Zealand died
suddenly. These endangered birds may have died of a mystical disease. Penguins 10.______
also have natural enemies, including wild dogs, sharks, seals and sea lions. [br]

选项

答案 are——is

解析本题为主谓一致错误。主语是shortage，为单数名词，应该和is搭配使用。

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