[主观题]Maria wants _________(play)ping-pong.
[单选题]8.—Can we _______ ping-pong?—No,_______ tennis.A. play; let's playB. plays; let's playC. play; let's to playD. plays; let's to play
[主观题]I have a ping-pong ball and two bats.L _______play ping-pong.
[主观题]反应曲线(Reaction curve)
[名词解释] 交叉反应(cross reaction)
[名词解释] 副反应(side reaction)
[名词解释] 反应曲线(Reaction curve)
[名词解释] Stickland反应(Stickland reaction)
[名词解释] 希尔反应(Hill reaction)
[名词解释] 免疫反应(immune reaction)