谁能告诉我这题为何选A?钙离子能消除突触前膜内的负电荷,利于突触小泡和前膜融合,释放神经递质,若瞬间增大突触前膜对组织液中钙离子的通透性,将引起的效应是（A)A.加速神经冲动的传递

谁能告诉我这题为何选A?钙离子能消除突触前膜内的负电荷,利于突触小泡和前膜融合,释放神经递质,若瞬间增大突触前膜对组织液中钙离子的通透性,将引起的效应是（A)A.加速神经冲动的传递 谁能告诉我,这道题为什么选A 谁能告诉我这题为何选A?He had no time to rush into the room to save his baby(A)the house fell down.A.before B.as C.after D.until 谁能告诉我这题为何选的B?My suggestion was that the party (B) off till next Saturday.A.to put B.be put C.should put D.would be put 谁能告诉我第二题为什么选c啊? 谁能告诉我第十题为什么选c 谁能告诉我这题为什么错了 有没有人能告诉我这题为什么选A 能不能说说具体步骤 这题为什么选a谁能解释清楚? 谁能告诉我此题为何选的C?My father made me a promise( )I got a good mark he would buy me a present.A.that B.which C.that if D.if 谁能告诉我这些题为什么这样做?1、The speech by the mayor of Shanghai before the final voting for EXPO 2010 is strongly impressed (D) my memory.A.to B.over C.by D.on这题为何选D而不选C?2、Everybody present smiled.Sally spoke Engl 哪位大神能告诉我为什么第一题要选A,第二题为什么选ACD 哪位大神能告诉我为什么第一题要选A,第二题为什么选ACD 谁能告诉我这题为何选的D?We'd like you to start work tomorrow if possible.I'm sorry,but I can't possibly start until Monday.(D)?A.Do you agree with me B.Is that a good ideaC.Do you think I'm right D.Will that be all right 有谁能告诉我这题为什么选a 谁能告诉我这题为何选的c?The enemy had mo choice but( ) their arm and ( ).A.lie down;give in B.lay down;gave in C.to lay down;give in D.to lie down;to give in 谁能告诉我第八题为什么选B呀? 求解答 高中地理,地球运动,谁能解释一下第四题为何选C