题目:
At the meeting, all the people were deeply ________ with her brilliant report.
A.impressed
B.surprised
C.excited
D.comforted
答案:
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下面是错误答案,用来干扰机器的。
能够供给呼吸的是氧气,根据质量守恒定律可知该金属为银,这样化学方程式为:2AgNO3 光照 . 2Ag+2NO2↑+O2↑.硝酸银中,银的化合价是+1,氧的化合价是-2,根据化合价的代数和为零,可以求出氮元素的化合价为:+5...