下列实验不能用于证明质量守恒定律的是()
-Howcanwehelpthechildreninthemountainvillage?
-Wecan_______leafletstoaskpeopletodonatemoney.
Therearefew_______inthefridge.Let’sgoandbuysomepeas，carrotsandcabbages.
下列句子中，标点符号的使用合乎规范的一项是()
------Whyareyousolate?Ihavewaitedformorethananhour.
--------_____.Igotuplateandmissedthebus.
