何单位或个人禁止在公路上设卡、收费、拦截车辆和（）。

下列反应的离子方程式正确的是（　　）

①氯气与水反应Cl₂+H₂O=2H⁺+Cl ^-+ClO^-

②将金属钠加入水中  2Na+2H₂O=2Na⁺+2OH^-+H₂↑

③石灰石溶于醋酸CaCO₃+2CH₃COOH=2CH₃COO^-+Ca²⁺+CO₂↑+H₂O

④氧化铁可溶于氢碘酸：Fe₂O₃+6H⁺=2Fe³⁺+3H₂O

⑤小苏打溶液中加入少量的石灰水：Ca²⁺+2OH^-+2HCO₃^-=CaCO₃↓+CO₃^2-+2H₂O

⑥Na₂S溶液呈碱性：S^2-+H₂O=HS^-+OH^-

⑦钠与硫酸铜溶液反应：Cu²⁺+2Na=2Na⁺+Cu

⑧硫酸铜溶液与氢氧化钡溶液反应：Ba²⁺+SO₄^2-=BaSO₄↓

A．①②⑤

B．②③⑤

C．④⑥⑦

D．②③⑧

阅读理解。

     Making pulp (纸浆) and paper is a traditional industry in Canada. According to the Canadian Pulp and

Paper Association, Canada supplies 34% of the world's wood pulp and 49% of its newsprint paper. If these

paper products could be produced in some other way, Canadian forests could be left. Recently, a possible

way of producing paper has been suggested by agriculturalists and environmentalists: a plant called hemp (麻).

     Hemp has been grown for a long time. It produces fiber which can be made into paper, fuel, oil, food and

rope. For centuries, it was very important to the economies of many countries because it was used to make

big ropes used on sailing ships. The worldwide trading network would not have been possible without hemp.

Nowadays, ships' ropes are usually made from wire or fibers, but scientists are now suggesting growing hemp.

In fact, four times as much paper can be produced from land using hemp rather than trees, and many

environmentalists believe that the large-scale growing of hemp could reduce the pressure on Canada's forests.

     However, there is a problem: hemp is illegal in many countries of the world. This plant, which is related to

the plant from which a drug called marijuana (大麻毒品) is produced, is very useful for fiber, rope, oil and

fuel. In the late 1930s,a movement to ban the drug marijuana began, resulting in the banning of the growing

not only of the plant used to produce the drug, but also of the commercial fiber producing hemp plant. In fact,

the drug marijuana cannot be produced from the hemp plant, since it doesn't contain the active ingredient (成

分)in the drug. In recent years, many people try to make it legal to grow the plant and sell the fiber for

production.

1. Why is pulp and paper production important to Canada?

A. Canada needs to find a way to use all its spare wood.

B. Canada publishes a lot of newspapers and books.

C. Pulp and paper export is a major source of earning money for Canada.

D. Hemp is a traditional plant of Canada.

2. In the past worldwide trade, the plant hemp was used as _______.

A. a material for ships' ropes

B. a very rewarding export

C. fuel for ships

D. food for sailors

3. Hemp was banned because _______.

A. it is related to the marijuana plant

B. it can be used to produce marijuana

C. it was no longer a useful crop

D. it was harmful to the land

4. According to the passage, what can be used to make paper?

A. Trees.

B. Hemp plant.

C. Marijuana plant.

D. Both trees and hemp plant.

下列哪种说法正确（）

A.接种流感疫苗后可以获得终身免疫

B.接种流感疫苗后可以产生10年以上的免疫力

C.接种流感疫苗后可以产生5年以上的免疫力

D.接种流感疫苗后对任何型别的流感都有预防作用

E.接种流感疫苗后可以在半年至一年左右对同型流感具有预防作用

已知int a, b；用语句scanf("%d%d", &a, &b)；输入a，b的值时，不能作为输入数据分隔符的是

A．,

B．. 空格

C．回车

D．Tab键

下列不属于脾生理功能失调的是

A．便溏泄泻
B．纳食不化
C．水湿中阻
D．气机上逆
E．脘腹冷痛