下列各组溶液,只要用试管和胶头滴管,不用任何化学试剂就可以鉴别的一组是
—Look at that rubber. --______ A.No, it isn’t. B. Sorry. C. How nice !
--______ is it ? –It’s over there. A. What colour B. What C. Where
This is a pen, and _____ a pencil. A. that B. this C. that’s
---Is this your lunch box? ---Yes, _____. A.it isB. it’s C. it isn’t
It’s ______ , it’s time for bed now . A. three o’clock B. nine o’clock C. two o’clock