26.Most parks in our city are free. They don’t charge money for ________.
A.agreement B.admission C.allowance D.permission
25.The meal over, the managers went back to the meeting room to _______ their discussion.
A.put away B.take down C.look over D.carry on
24.The school dinning room _______ as a meeting place for teachers and students.
A.treats B.admits C.functions D.uses
23.The old man was found _______ on the floor _______.
A.lying; died B.lying; death C.lying; dead D.laying; dead
22.He had a wide _______ of interests, which made him a popular person that all of us like to make friends with.
A.world B.variety C.various D.difference
第一节:多项选择(共10小题;每小题1分,满分10分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
21.Though having lived abroad for years, many Chinese still _______ the traditional customs.
A.perform B.possess C.observe D.support
16、(14分)如图15所示,A、B为两块距离很近的平行金属板,板中央均有小孔。一细束电子从A板小孔水平射入A、B之间,电子刚到A板小孔时动能为100 eV,电子束是连续不断地射入的。在B板右侧,平行金属板M、N之间加20 V恒定电压。整个装置在真空中。MN组成的电容器中,板长为4×10-2m,板间距离为8×10-3m。现在A、B两板间加一个交变电压U1,在t=0到t=2 s时间内,A板电势高于B板,则在U1随时间变化的第一个周期内,在哪段时间内电子从偏转电场右侧飞出。(不计电子在AB板间运动的时间)
15、(12分)如图14所示,在光滑的水平杆上套者一个质量为m的滑环,滑环上通过一根不可伸缩的轻绳悬吊着质量为M的物体(可视为质点),绳长为L。将滑环固定时,给物块一个水平冲量,物块摆起后轻绳恰好能摆至水平位置,若滑环不固定,仍给物块以同样的水平冲量,求物块摆起的最大高度。
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