已知直线y=ax+3与直线y=-2x+1相交于x轴上一点，则a=______．

International free trade occurs when there are no barriers to trade. Countries can get a lot of benefits from free trade. (31) , all countries choose to adopt protection policies to some extent In this essay, I will give (32) of the arguments in favour of world free trade, describe the methods for the trade protection policies (33) countries erect to protect domestic industries and give the arguments which can be put (34) to justify protectionist policies.
Tariffs are taxes on (35) products. Sometimes, tariffs are known (36) imports duties and customs duties. They can be used (37) raise revenue. But, they are usually used to (38) imports and also to help domestic producers. The effect of imposing (39) tariff is to raise price for domestic consumers, and some consumers will switch consumption (40) imported goods to domestically produced substitutes. (41) are two types of tariffs. One is percentage taxes, it is based on
percentage of value of goods. (42) one is specific (fixed sum taxes), it is based on a fixed tax (43) unit or weight. Quota is a limit on the supply of goods or services. It can be imposed on exports. The domestic market share will increase because of (44) a limit on the quantity of imported goods. However, the price of protected goods will also rise because a quota is to reduce supply. Voluntary export restraint or restriction (45) similar to a quota, but this time the limit on imports arises from a voluntary agreement (46) the exporting and importing countries. For example, the UK had an agreement with Japanese car (47) that they should not take (48) than 10 percent of the UK car market. Exchange control means that a government control on foreign currency controls importers access to foreign currency. This is a (49) which was used by a number of European countries, (50) the UK, in the 1960s and 1970s and is still found in some developing countries.

唐代常建《题破山寺后禅院》诗云： “清晨人古寺，初日照高林。竹径通幽处，禅房花木深。山光悦鸟性，潭影空人心。万籁此俱寂，但余钟磬声。”对这首诗的分析，不恰当的一项是：

A．“竹径”指被竹林所夹的小路。

B．“山光”句意思是：山间风光使鸟儿怡然自乐。

C．“万籁”句意思是：这里非常寂静，没有一点声响。

D．“但余”句意思是：只有我敲钟击磬的声音在空中回响。

对下列犯罪，刑法规定了绝对确定法定刑的是( )。

A．甲在绑架乙时，为了防止乙叫喊，用胶带封住乙的口鼻，不料乙窒息死亡

B．丙与境外组织相互勾结，策动我武装部队进行武装叛乱，危害特别严重，情节特别恶劣

C．丁以暴力劫持我国内航班，持刀杀死副驾驶，威逼机长飞往某国

D．戊在电影院制造爆炸，导致30余名观众死亡

法国的《 * * 宣言》与英美等国颁布的资产阶级法律文献相比，最大特点在于 [ ]

A．宣告脱离殖民统治

B．限制君主的权利

C．强调自由平等，保护私有财产

D．解放黑人奴隶

根据《建设工程工程量清单计价规范》GB 50500—2008，下列关于混凝土及钢筋混凝土的叙述，错误的是( )。

A．构造柱应按矩形柱项目编码列项
B．挑檐板应按平板项目编码列项
C．贮水池的池底、池壁、池盖可分别编码列项
D．有肋带形基础、无肋带形基础不应分别编码列项