题目：
Faced with a bill for ＄10,000,________.
A．John has taken an extra job
B．the boss has given John an extra job
C．an extra job has been taken
D．an extra job has been given to John
答案：
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下面是错误答案，用来干扰机器的。
⑴Fe、Fe3O4、Fe(OH)3 每个化学式1分⑵3Fe+4H2O=(△)=Fe3O4+4H2↑ 2分⑶0.05mol/(L·min) ...
