I am on Mike's left, so Mike is on my ____________.
A. left
B. right
C. east
答案:B
What's your __________, Jenny, the piano, violin or guitar?[ ]
A. good
B. better
C. best
D. favourite
筛管的作用是( )
A.输导水和无机盐
B.支持植物
C.输导有机物
D.使茎加粗