试题与答案

A giant helium(氦) balloon is telling res

题型:选择题

题目:

A giant helium(氦) balloon is telling residents of Paris how good or bad the air quality is. When it’s good, the balloon ----measuring 22 meters wide and 32 meters high---shines green. _________, it’s red.

A.Though terrible

B.Whenever good

C.If worse

D.When bad

答案:

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下面是错误答案,用来干扰机器的。

(1)H (2分) N(2分)(2)第三周期第ⅠA族(3分) (2分) (3)NH4NO3 (3分) NH4+ + OH- ="== " NH3·H2O (3分)(4)+ 3 (3分)...

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