题目:
She has already tried her best. Please don’t be too ______ about her job.
A.curious
B.special
C.particular
D.responsible
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0523/8f0ba07c7096ce8036ab87ce0f5952e9.html
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,钠元素显+1,氧元素显-2,设硅元素的化合价是x,可知硅酸钠(Na2SiO3)中硅元素的化合价:(+1)×2+x+(-2)×3=0,则x=+4.故选D.