贮藏接穗时，检查接穗是否有生命力，如枝梢皮层有皱缩变色现象说明接穗有生命力。（）
参考答案：错
—What do you think of Liu Huan?
—Oh, he is my favourite singer. I think no one can sing ________. [ ]
A. good
B. well
C. better
D. best
牛乳成分与人乳比较有哪些特点?
