2021年考博英語完型填空模擬試題及答案

Every human being has unique arrangement of skin on his fingers andthis arrangement is unchangeable. Scientists and experts have proved the 1 offinger-prints and discovered that no 2 similar pattern is 3 from parents tochildren, 4 nobody knows why this is the 5 . Yhz亚洲国产精品va在线观看麻豆