大黄比小黄多钓了几条鱼?
____ (____)____=____(条)
-15的相反数是____ .
It is _______ difficult work that he isn't able to do it _______.
①乙型肝炎 ②淋病 ③梅毒 ④流感 ⑤艾滋病 ⑥疱疹 ⑦尖锐湿疣 ⑧系统性红斑狼疮