【简答题】完形填空 One morning I wasted nearly an hour watching a tiny ant carry a huge feather.Several times,it __ 1 __ several obstacles(障碍物)in its path.And after a momentary pause it would make the necessary det...
【单选题】(2016· 浙江卷 ) 命题 “ ∀ x ∈ R , ∃ n ∈ N * ,使得 n ≥ x 2 ” 的否定形式是 ( )
A.
∀ x ∈ R , ∃ n ∈ N * ,使得 n < x 2
B.
∀ x ∈ R , ∀ n ∈ N * ,使得 n < x 2
C.
∃ x ∈ R , ∃ n ∈ N * ,使得 n < x 2
D.
∃ x 0 ∈ R , ∀ n ∈ N * ,使得 n < x
【简答题】One morning I wasted nearly an hour watching a tiny ant carry a huge feather. Several times, it 31 several obstacles in its path. And after a momentary pause it would make the necessary detour (绕道). 3...
【简答题】“入芝兰之室,久而不闻其香”,这种情况属于嗅觉的____。
【简答题】Watching the huge crowds , we saw (laugh) ______ , cheers, hugs and tears .
【单选题】关于痢疾杆菌下列哪项是错误的()
A.
如果人体胃酸分泌正常则可杀死进入胃内的痢疾杆菌
D.
肠道局部分泌的IgA抗体可阻止痢疾杆菌吸附肠黏膜
【单选题】命题“ , ,使得 ”的否定形式是( )