从方框中选择适当的短语，并用其正确形式填空。
more and more be careful at weekends at the same time thanks to
读“我国北方和南方水土资源的比较”，回答下列问题．
用显微镜观察撕下的蚕豆叶下表皮装片和蚕豆叶的横切面装片，可以看到右面有关气孔的两个图象．下列叙述正确的是（ ）
⑴Here you are.____ A. Yes, I do.
⑵Is this your watch?____ B. It's a watch.
⑶What's it?____ C. Thank you.
⑷Do you like apples?____ D. No,it isn't.
①芽原基 ②叶原基 ③分生区 ④生长点 ⑤形成层 ⑥伸长区．
