【单选题】—Mr. Li, I found a watch on the playground. —You should try to find out _______. [ ]
B.
who is the owner of the watch
C.
whom does the watch belong to
【单选题】费德勒模型中,用三个指标来界定下属与情境。( )
A.
领导成员之间的关系,任务结构化程度,职位权力;
【单选题】—Where’s Li Hua? —Look! He ____ tennis on the playground.
【单选题】---Where’s Li Hua? ---Look! He _______ tennis on the playground.
【简答题】.在考古工作中,可以从古生物遗骸中 的含量推算古生物到现在的时间 。设 是古生物遗骸中 和 存量之比, 是空气中 和 的存量之比。试证明: ,式中 为 的半衰期。(9分)
【单选题】选出句中的宾语补足语: Did you see Li Ming playing football on the playground just now ?