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【单选题】
二尖辨(左房室辨)附着于A.
主动脉口
B.
左房室口
C.
右房室口
D.
口
E.
.肺动脉口
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【简答题】Later when the children came home for the week of Christmas, the house was bright with Christmas colours.
【单选题】When did her mother put Christmas presents in her stockings?
A.
On Christmas Eve.
B.
Every night.
C.
On Christmas night.
【简答题】有一半径为R的均匀带电球体，电荷体密度为+ρ，今沿球体直径挖一细隧道，设挖隧道前后其电场分布不变，如图所示。现在洞口处由静止释放一点电荷-q，其质量为m，重力在此忽略不计。试分析点电荷在隧道内的运动规律。
【简答题】Christmas is a time of all others when want is keenly felt, and abundance rejoices.
【单选题】When Christmas Day is coming, the parents .
A.
usually tell their children that Father Christmas isn't real
B.
sometimes tell their children that Father Christmas comes during the day
C.
tell their children that Father Christmas comes during the night and brings presents to good children
D.
often tell their children that Father Christmas gives presents to poor children
【单选题】In 'LoveActually', Harry is not happy with ()when he is doing Christmas shopping with his wife.
A.
Mia
B.
the sales clerk
C.
his employee
D.
his child
【单选题】四企业集中程度越高，行业内的竞争性_________；赫芬达尔一赫希曼指数越大，行业内的竞争性_________。
A.
越强；越强
B.
越强；越弱
C.
越弱；越强
D.
越弱；越弱
E.
这个问题的前提是错误的，因为四企业集中率只适用于市场内只有四家企业的市场，根据定义，这样的市场是没有竞争性的
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