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请教两道改错，多谢！
| 1 (During flight) the flamingo’s (neck) is stretched forward and the legs (were extended) straight out (behind the) body.
答案为C，怎么改？
2 (When) researchers checked blood samples of 55 cheetahs from two (samples) areas of South Africa, they found them (to be) almost genetically (identity).
答案为D，我知道D错了，但B是不是该为单数，因为名词1修饰名词2，名词1应为单数
感谢您的帮助！ |
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