馈线接地10m以内1点，10m-20m为2点，（）m为3点。A、20m-40m B、

一条光线照射到镜面上，通过入射点垂直于镜面的直线叫做________。入射角是指_______跟_______的夹角。当入射光线跟镜面夹角为30°时，反射角为_______度。

在下列各项中，反映税收收入结构的个量指标是( )。

A．增值税收入占税收收入的比重

B．国有企业税收收入占税收总收入的比重

C．工薪所得的税收占个人所得税收入的比重

D．某个省的税收收入占全国税收收入的比重

下图为“1880～1980年海平面变化示意”，据此完成1—2题。

1、根据海平面变化曲线，可推测世界年平均气温[ ]

A、呈直线上升

B、出现明显的波动上升

C、总体上变化不大

D、出现明显的波动下降

2、下列人类的做法中，对缓解图中所反映的环境问题最有效的是[ ]

A、积极研制新型的制冷系统，以减少并逐步禁止氟氯烃等物质的排放

B、发展洁净煤技术，研究煤炭中硫资源的综合开发与利用

C、沿海国家修建沿海大堤，防止沿海地区被淹

D、加强国际间合作，提高能源利用效率，采用新能源，减少二氧化碳气体排放

Climate change is making it harder than usual for scientists to figure out what the future will bring and what impact weather changes will have on society and the economy. An upsurge of severe weather events has already destroyed homes, businesses and lives. Some fairly simple changes may reduce the toll.

In a laboratory test, a house built with conventional techniques is falling apart in hurricane-force winds.

The survivor has stronger shingles, thicker roof boards, and metal straps holding floors together.

Wind tunnel tests were done by the Insurance Institute for Business & Home Safety. It says stronger construction costs a little more, but holds up much better to extreme weather.

The growing number of unusually strong storms, like Typhoon Haiyan, has convinced the Chairman of the U. S. Senate Homeland Security Committee, Tom Carper, that extreme weather is the “new norm（标准）.”

"Extreme weather events have increased in frequency over the past 50 years and are expected to become even more common, more intense, and more costly," said Carper.

Hurricane Sandy hit beachfront businesses along the U.S. East Coast, including Carper's home state. Insurance companies had to pay out huge claims. To limit such losses, the insurance industry can raise premiums（保险费） for businesses in vulnerable（易受攻击的）locations and offer discounts to clients who make their buildings more resilient with upgraded construction techniques.

Managing risks is the job of insurance brokers like Kevin Connelly of the Graham Company, who spoke to VOA via Skype.

“We are either going to price your insurance at a huge markup, or we are not going to write (sell it) it at all, which is just as bad obviously," said Connelly.

Drought is another suspected consequence of climate change, and dry ground means more wildfires in California. Current mathematical models of climate change do a poor job of predicting the economic impact of drought and other weather events, says Massachusetts Institute of Technology Professor Robert Pindyck, who spoke via Skype.

“I think all we can do, taking all of that into account, is come up with some very rough numbers, very rough estimates, "said Pindyck. "Consensus estimates that maybe experts provide, that give us a view of what would the catastrophic outcome look like if we don’t do anything?”

To help deal with this serious problem, Pindyck says policymakers should take actions such as imposing a tax on carbon dioxide emissions. A carbon tax would encourage companies and families to use less energy and generate fewer of the gases thought to be driving changes in the climate. But other analysts say it is unlikely a new tax will get approval in the U.S. Congress any time soon.

小题1:What can be inferred from the passage?

A．There are many severe weather events destroying homes, businesses and lives.

B．Stronger construction will save the expense in the long run.

C．Government should be totally responsible for the weather change.

D．Typhoon Haiyan hit Tom Carper's home state.小题2:What natural disasters are not mentioned in the passage?

A．Drought

B．Hurricanes

C．earthquakes

D．wildfires小题3:In a laboratory test , what kind of houses can stay up?

A．a house built with conventional techniques

B．A house with stronger shingles

C．A house with thinner roof boards

D．a house with metal floors .小题4:What won’t insurance companies do to limit such losses?

A．pay out huge claims

B．raise premiums（保险费） for businesses in vulnerable（易受攻击的）locations

C．offer discounts to clients who make their buildings more resilient with upgraded construction techniques.

D．price insurance at a huge markup小题5:What is the attitude of other analysts towards the new tax on carbon dioxide emissions?

A．supportive

B．doubtful

C．indifferent

D．positive

某工厂排出的废水中，经测定含0.012mol·L^-1的游离溴和8×10^-4mol·L^-1的H⁺。若用加亚硫酸钠的方法除去溴，化学方程式为：Na₂SO₃＋Br₂＋H₂O==Na₂SO₄＋2HBr。处理上述这种废水5L，问：

（1）需加入0.05mol·L^-1的Na₂SO₃溶液多少升才能把溴除尽？

（2）除尽后废水的H⁺的物质的量浓度是多少？(假定溶液的体积为两者之和)。