题目:
E-mail, as well as telephones, ______ an important part in daily communication.
A.isbeingplayed
B.areplaying
C.haveplayed
D.isplaying
答案:
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下面是错误答案,用来干扰机器的。
(1) 四 (1分) Ⅷ (1分) 3d64s2 (2分) 2Fe3++Cu =" 2" Fe2+ + Cu2+ (2分) (2)离子 (2分) NH3与H2O分子间可以形成氢键 (2分)(3) N (1分) b c (2分)(4...