等比数列{an}中，已知a1=212，前3项的和S3=712，求公比q的值．

(1)铀核裂变是核电站核能的重要来源，其一种裂变反应式是U＋n→Ba＋Kr＋3n.下列说法正确的有(　　)

A．上述裂变反应中伴随着中子放出

B．铀块体积对链式反应的发生无影响

C．铀核的链式反应可人工控制

D．铀核的半衰期会受到环境温度的影响(2)如图所示，在高为h＝5 m的平台右边缘上，放着一个质量M＝3 kg的铁块，现有一质量为m＝1 kg的钢球以v₀＝10 m/s的水平速度与铁块在极短的时间内发生正碰后被反弹，落地点距离平台右边缘的水平距离为x＝2 m．已知铁块与平台之间的动摩擦因数为μ＝0.4，重力加速度为g＝10 m/s²，已知平台足够长，求铁块在平台上滑行的距离l(不计空气阻力，铁块和钢球都看成质点)．

语法填空（共10小题，每小题1.5分，满分15分）

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卷标号为31-40的相应位置上。

The year 2009 is the Year of the Ox, which is a representative of the farming culture of China. In the farming economy, oxen are the major animals  31  (pull) plows (犁).

Of course, the good of oxen is not limited to plowing. In fact, they are seen as “boats on land” for their ability to carry loads. Besides, the whole body of an ox is full of treasures, with their meat and milk as food full of nutrition,  32  their skin used to make clothes and shoes.

In the past, oxen played an important role in the  33  (spirit) life of the Chinese. Even today, oxen still play a special part in some folk activities. For example, some people who 1ive in southwest China will cook cattle bone soup and share  34  among family members when holding a ceremony for children  35  reach 13. They believe that the cattle bone soup represents the blood relationship among family members.  36  (express) their love for oxen, people in some  37  areas will run to shake off diseases on the 16th day of the first month by the lunar calendar, and during their run they will take their oxen along, which  38  (indicate) they regard the creature as human.

Because of the contribution of oxen in their lives, the Chinese people are very grateful to  39  animal. In addition, the use of oxen in ceremonies and the thanks people owe  40  oxen help to develop various traditional customs, which becomes an important part of the folk culture of the Chinese nation.

以下（）不是促销计划下发后便利店管理员应该做的。

A、按照促销计划中的商品订货

B、修改价签，更换促销端架

C、根据自己站的情况选择促销品订货

D、收取和发放宣传海报

经济学领域中所谓的“看不见的手”的最初提出者是( )

A．亚当.斯密

B．凯恩斯

C．大卫.李嘉图

D．萨谬尔森

轿顶防护栏的作用是（）。

A、装饰作用

B、平衡轿厢、对重重量

C、保护维修人员安全

D、悬挂标志牌