佛坪国家级自然保护区是我国秦巴山区首个珍稀野生动物国家级自然保护区。
参考答案:错
When the man came in, gun in hand, we all stood there, ________.[ ]
A. astonishing
B. being astonished
C. astonished
D. having astonished
21号染色体的三体引起的畸形称为()。