鳶尾的花期是（）月。
A.4
B.5
C.6
D.7
参考答案：B
CO、O2、CO2混合气体9mL电火花引爆后，恢复到原来状态时，气体体积减少1mL，通过NaOH溶液后，体积又减少5mL，则混合气体中CO、O2、CO2体积比可能为 ___ __ 。
At first I was a little worried，but I’m glad that things have _____quite well for me.
A. carried out B- worked out C. figured out D. made out
