等差数列的相邻4项是a+1,a+3,b,a+b,那么a,b的值分别是 [ ]
A.2,7
B.1,6
C.0,5
D.无法确定
答案:A
小题1:Three (孩子) are having lunch.
小题2:My father doesn’t like my job because it’s too ______________(危险).
小题3:How many ___________ (图书馆) are there in your school?
小题4:Mr Wang (教) us science.
小题5:The (开始)of the story is kind of scary.
小题6:Please write and tell me about ___ . (你自己)
小题7:I want to be a singer because it is a (放松的) job.
小题8:The shop is (开着的) from 8:00am to 9:00pm.
小题9:My pen pal is .(法国人)
小题10:The supermarket is (后面)the post office.
护患关系是一种
A.社交关系B.人际关系C.公共关系D.合同关系E.合作关系