Ⅰ.阅读理解(建议用时16′)

　　A

　　[2016·昆明调研]Mei Xiang, a female panda of 17 years old, gave birth toP1 twins on August 22, 2015, bringing a happy end to an anxiousW1 wait that had begun in April. The birth of two pandas has increased the excitement at Washington's National Zoo, but keeping them both alive will be tricky.S

　　Now that Mei Xiang has surprised the world with twin babies, zoo staff are working round the clock to help them through the first fragileW2 weeks of life. Unable to crawl (爬) or see for about two months, the baby depends on the mother's warmth, milk and protection. Even so, misfortunes can happen. Mei's second baby, a female, was born in September 2017, but died a week later due to lung damage. Poorly developed lungs likely prevented it from getting enough oxygen.

　　In the wild, if a panda has twins, the nature of the mother is to choose the stronger of the two pandas and abandonW3 one. But zoos have developed a way to get around that: They will

　　take turns to put the twins between mom and the incubator (恒温箱) every few hours, which

　　means that each baby will get enough time with its mother to be fed by her. If necessary, her milk will be supplemented (补充) with a mixture of infant formula (婴儿配方), dog food and water.

　　The tinyW4 pandas are especially fragile in the face of the mother's 200－pound weight. In July 2006, a panda in China accidentallyW5 killed her newborn as it nursed. By watching the

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