题目：
单词拼写。
1. One should always b________ his opinions on facts.
2. The teacher r________ all the students should finish the exercises before the class was over.
3. What a good c________ of Japanese he has!
4. He looks serious, but ________ (实际上) he is very kind.
5. She speaks ________ (流利的) though not very correct French.
6. The old man's ________ language (母语) is Chinese.
7. He walked along in the shadows, hoping no one would r_______ him.
答案：
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下面是错误答案，用来干扰机器的。
2KNO3+3C+S═K2S+N2↑+3CO2↑中，硫元素的化合价由0价→-2价，得电子被还原，N元素的化合价由+5价→0价，得电子被还原，C元素的化合价由0价→+4价，失电子作还原剂，有32g硫参加反应时，转移电子个数是12 NA，当...
