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【单选题】
What is not usually used to decorate the Christmas trees?A.
Colored lights
B.
Bright ornaments
C.
Silver tinsel
D.
Turkey
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反馈参考答案：
举一反三
【单选题】平面简谐波在弹性媒质中传播,某一时刻媒质中某质元在最大位移处时,它的
A.
动能为零，势能最大
B.
动能为零，势能为零
C.
动能最大，势能最大
D.
动能最大，势能为零
【单选题】The best title for the text might be
A.
Managers and Stress.
B.
Negative Effects of Change on Managers.
C.
Managers and Organizational changes.
D.
How to Deal with Corporate Changes.
【单选题】平面简谐波在弹性媒质中传播,某一时刻媒质中某质元处于平衡位置时,它的
A.
动能为零，势能最大
B.
动能为零，势能为零
C.
动能最大，势能最大
D.
动能最大，势能为零
【单选题】一平面简谐波在弹性媒质中传播时，某一时刻在传播方向上一质元恰好处在负的最大位移处，则它的( )。
A.
动能为零，势能最大
B.
动能为零，势能为零
C.
动能最大，势能最大
D.
动能最大，势能为零
【单选题】Matt and his mother are going to visit Aunt Becky tomorrow so _____.
A.
they have to get up early
B.
Matt has to be home early
C.
John cannot sleep over after the party
【简答题】高锰酸钾是常用的氧化剂．工业上以软锰矿（主要成分是MnO 2 ）为原料制备高锰酸钾晶体．如图是实验室制备的操作流程： 上述反应②的化学方程式：3K 2 MnO 4 +2CO 2 ═2KMnO 4 +MnO 2 +2K 2 CO 3 已知： 物质 K 2 CO 3 KHCO 3 K 2 SO 4 CH 3 COOK 293K溶解度（g） 111 33.7 11.1 217 （1）加热软锰矿、KClO...
【单选题】Why did the author tell Matt that she and her boyfriend were going to get married?
A.
Because she didn’t want Matt to disturb her quiet life.
B.
Because she didn’t like Matt.
C.
Because Matt is an Englishman.
D.
Because she didn’t know Matt.
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