[单选题]22.Emperors are the largest of all penguins — an average bird stands some 45 inches tall. These flightless animals live on the Antarctic ice in the cold surrounding waters. Penguins employ physiological adaptations cooperative behaviors in order to deal with an incredibly harsh environment, where wind chills can reach -60°C.
AEmperor penguins spend the long winter on the open ice — even breed during this harsh season. Females lay a single egg then promptly leave it behind. They undertake an extended hunting trip that lasts some two months! Depending on the extent of the ice pack, females may need to travel some 50 miles just to reach the open ocean, where they will feed on fish, squid, krill. At sea, emperor penguins can dive to 1,850 feet — deeper than any other bird — stay under for more than 20 minutes.
BMale emperors keep the newly laid eggs warm, but they do not sit on them, as many other birds do. Males stprotect their eggs from the elements by balancing them on their feet covering them with feathered skin known as a brood pouch. During this two-month bout of babysitting the males eat nothing are at the mercy of the Antarctic elements.
CWhen female penguins return to the breeding site, they bring a belly full of food that they regurgitate for the newly hatched chicks. Meanwhile, their duty done, male emperors take to the sea in search of food for themselves.
DMothers care for their young chicks protect them with the warmth of their own brood pouches. Outside of this warm cocoon, a chick could die in just a few minutes. In December, Antarctic summer, the pack ice begins to break up open water appears near the breeding site, just as young emperor penguins are ready to swim fish on their own.
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F22.1 In order to deal with the harsh environment, penguins____.
Gmigrate to find better breeding or feeding grounds
Htry to adapt to the environment physiologically
Iimprove each individual’s ability
Jonly breed during comfortable seasons
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