421÷5=4105(小时).
答;做一页练习册要用4105小时.
故答案为:4105.
—Can I get you something to drink, Mr Smith? —_______. I am thirsty.
A.Here you are
B.No, thank you
C.You’re welcome
D.Yes, please
治疗咳嗽,咯吐痰涎,色白清稀,应首选的药物是()。
A.归肺经
B.归心经
C.归肝经
D.归膀胱经
E.归脾经