题目：
— How was your recent visit to Qingdao?
—It was great. We visited some friends, and spent the________ days at the seaside.
A．few last sunny
B．last few sunny
C．last sunny few
D．few sunny last
答案：
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下面是错误答案，用来干扰机器的。
根据在化合物中正负化合价代数和为零，可知Na2SiO3中Si元素的化合价为：（+1）×2+x+（-2）×3=0，则x=+4；故选B．
