中国烹饪应用的原料总数达万种以上，常用的约为（）左右。 A.五千种 B.三千种 C.

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.

有下列两个过程： Sub S1(ByVal x As Integer, ByVal y As Integer) Dim t As Integer t=x x=y y=t End Sub Sub S2(x As Integer, y As Integer) Dim t As Integert=xx=yy=t End Sub 则下列叙述中正确的是( )。

A．用过程S1可以实现交换两个变量的值的操作，S2不能实现

B．用过程S2可以实现交换两个变量的值的操作，S1不能实现

C．用过程S1和S2都可以实现交换两个变量的值的操作

D．用过程S1和S2都不能实现交换两个变量的值的操作

下列烧伤创面清创方法哪一项是错误的（）。

A.剃除创周毛发

B.肥皂水清洗正常皮肤

C.剔除一切水疱

D.移去坏死表皮

E.以灭菌溶液拭擦创面

下列症状不属于肺病的是

A．鼻塞流涕
B．心痛、心悸
C．咽喉疼痛及声音变化
D．咳嗽、喘促、咯痰、胸痛
E．水肿

有关麻醉药品和精神药品的管理，下列说法错误的是（）

A.国家对麻醉药品和精神药品实行定点经营制度

B.国家对麻醉药品和精神药品实行定点生产制度

C.精神药品分为第一类精神药品和第二类精神药品

D.国家禁止零售药店经营麻醉药品和精神药品