They were shocked at the____(令人恐惧的) news that they had cheated so much money.
三(1)班有45人,每人都参加了跳绳比赛或跑步比赛.跳绳比赛的有28人,跑步比赛的有24人,两种活动都参加的有( )人.
俗话说“一母生九子,连母十个样”,体现了生物多样性的哪个层次( )