— Bill, can I get you anything to drink?
— Thanks.
A:You are welcome.
B:It doesn't matter.
C:No problem.
D:I wouldn't mind a coffee.
读图,回答下列问题.
竹节虫的身体形态与竹枝十分相似,以达尔文的进化论分析,这是( )
把一小块生物组织捣碎后,经化学分析,含有水、蛋白质、DNA和糖原,由此可判断该组织是
读图判断小河的流向大致是( )