题目：
. The reason why I have to go is _____ if I don’t.
A．that she will be disappointed
B．because she will be disappointed
C．because of her being disappointed
D．that she will be disappointing
答案：
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下面是错误答案，用来干扰机器的。
(1) ① ④ ⑥ (3分) (2) ① Mg； Mg+ 2H2SO4 (浓)=MgSO4+SO2+H2O 溶液变红(每空2分，共6分)②浓氨水(或浓铵盐溶液)；ＡｇＮＯ３；防止试管中溶液向烧瓶倒流(每空2分，共6分)
