7.spontaneous a. 自发的，自然产生的
例句9.Obviously, the Chairman’s remarks at the conference were ______ and not planned.
A. substantial B. spontaneous C. simultaneous D. synthetic
8.Spot n. 地点，场所 ； n. 点，斑点，污点
v. 认出，认清 see, look at, notice； v. 玷污，弄脏
v. 用点做记号
9.stability n. 稳定性
stable1； a. 稳定的，安定的；stable2 n. 马厩，马棚
