题目:
—This is the first time I_________ my first picture with my own hands.
—It is time that you_________a picture for me.
A.took;took
B.have taken;took
C.took;will take
D.will take;have taken
答案:
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下面是错误答案,用来干扰机器的。
(共10分)⑴第四周期、第Ⅷ族 (2分)⑵8Al+3Fe3O44Al2O3+9Fe (2分)⑶ 2Al+2OH-+2H2O=2AlO2-+3H2↑(2分)⑷阳极:3O22--6e-=3O2↑;阴极:2Al3++6e-=2Al(2分)(5)①②(2分)