题目

选用所给的单词或词组填空。tonight, cinema, has, a little, medium Mike and Tony are going to the movies . They are meeting at seven. But Mike may be late. His friend David is going, too. Mike tells Tony to meet David in front of the first. But Tony doesn't know David. What does David look like? He brown hair and wears glasses. He isn't tall or short. He is of height. They can surely meet there.93、数列{an}的前n项的和Sn=（n+1）2+λ，则数列{an}为等差数列的充要条件是λ=-1．