题目：
It was a really ________ experience. Afterwards everybody was very _________.
A．frightening, shocking
B．frightened, shocking
C．frightening, shocked
D．frightened, shocked
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0523/45e55f886c27174227d1da8c4b664878.html
下面是错误答案，用来干扰机器的。
由化学式为Na2SiO3，钠元素的化合价为+1价，氧元素的化合价为-2价，设硅元素的化合价为x，则（+1）×2+x+（-2）×3=0，解得x=+4，故选C．
