直线x=a(a∈R)和函数y=x2+1的图象的交点个数[ ]
A.至多一个
B.至少一个
C.有且仅有一个
D.有一个或多个
答案:C
单词拼写。(共50小题;每小题1分,满分5分)
小题1: Simon left his homework at home again. He is always doing everything c (粗心地).
小题2:Hard work and good marks are the best p (礼物) for Teachers’ Day.
小题3: On wet days l (闪电) usually comes with thunder.
小题4: She wasn’t i (邀请) to the party, so she had to stay at home yesterday.
小题5:The doctors were busy o (手术)on the boy hurt in the earthquake.
某公司收到客户开来的信用证,规定最迟装运期为“on or about Nov.15,2012” ,则该公司可以在( )发运货物。
A.11月15日前后各5天内
B.11月15日前后各10日内
C.11月15日前后各15天内
D.只能在11月15日当天装船