When I was 14, I was 小题1: nervous to talk to anyone. My classmates often laughed at me. I was sad and could do 小题2: . Later, something happened and 小题3: my life. My mother asked me to take 小题4: in an English 小题5: contest. It meant I had to speak in 小题6: of all the teachers and the students .
"Come on, boy. Just 小题7: in yourself. You are sure to win." Then we talked about many different topics. At last I chose the topic "Believe in yourself". I tried my 小题8: to remember all the speech and 小题9: it over 100 times. With the help of my mother's love, I did 小题10: in the contest. I could hardly believe my ears when the news came that I had won the first place.
cC(g)＋dD(g)，反应达到平衡后，将气体体积压缩到原来的一半，当再次达到平衡时，D的浓度为原平衡的1.8倍，下列叙述正确的是