因储存养护等环节管理不善，会造成药品变质、过期失效。

It had been raining three days before we arrived, so we might as well _____ at home.

A．stay

B．to stay

C．have stayed

D．to have stayed

Although Jack has made good preparations for the match, he is still             about his chance of winning.

A．stubborn

B．dynamic

C．sceptical

D．straightforward

气态中性基态原子的原子核外电子排布发生如下变化，吸收能量最多的是（　　）

A．1s²2s²2p⁶3s²3p²→1s²2s²2p⁶3s²3p¹

B．1s²2s²2p⁶3s²3p³→1s²2s²2p⁶3s²3p²

C．1s²2s²2p⁶3s²3p⁴→1s²2s²2p⁶3s²3p³

D．1s²2s²2p⁶3s²3p⁶4s²4p²→1s²2s²2p⁶3s²3p⁶4s²4p¹

队列研究起始队列是（）

A.健康人

B.病人

C.暴露某因素的病人

D.筛检发现的病人

E.暴露某因素的非病人

对1－1，2－2，3－3绞辘穿引辘绳时，辘绳的根端应固定在：（）

A.动滑车尾眼上

B.定滑车尾眼上

C.挂头上

D.车壳上