—______. You'd better be careful.
A:I agree
B:That depends
C:I think so
D:No problem
____是有依据的猜测;假设的依据往往来自____,但经验并不完全可靠。
—Yes. She always encouraged us and gave us support we met difficulties.
某种降解塑料(C4H4O2)n能在乳酸菌作用下迅速分解成无毒物质,该降解塑料可制成餐具.下列有关降解塑料的叙述错误的是( )