某地15人接种某疫苗后，测得其抗体滴度从1：20到1：320不等，为求其平均滴度，最
题型：单项选择题
问题：
某地15人接种某疫苗后，测得其抗体滴度从1：20到1：320不等，为求其平均滴度，最好选用（）
A.众数
B.算术均数
C.几何均数
D.中位数
E.百分位数
题型：单项选择题
选词填空（10分，每小题1分）
小题1:_________________a concert tonight.Will you go with me?
小题2:Jim has a pet dog .He likes _________________ him _________________ after school.
小题3:They are _________________ where to go for a holiday.
小题4:He’s from the USA. His classmates always ask him _______________them______________his country.
小题5:His mother is friendly. She always______________ us some sweets______________.
小题6:Millie seldom ______________ , because she isn’t good at it.
小题7:–How long does your mother watch TV every day ? –______________ one hour.
小题8:They like playing basketball. They play basketball ______________.
小题9:–I’m going shopping. What do you need?
–Just______________.
小题10:He likes all kinds of ______________ , like basketball,football,badminton and so on.