问题 单项选择题

有机磷酸酯农药抑制的酶是

A.柠檬酸合成酶

B.己糖激酶

C.胆碱酯酶

D.异柠檬酸脱氢酶

E.琥珀酸脱氢酶

答案

参考答案:C

解析:[解题思路] 有机磷农药中毒,该农药包括敌敌畏,农药1059,敌百虫等,它们能特异地与胆碱酯酶的活性中心的丝氨酸羟基结合,使酶失活。乙酰胆碱不能被胆碱酯酶水解,乃积蓄而引起迷走神经高度持续兴奋的中毒状态。有机磷农药中毒的机制属于不可逆性抑制。

阅读理解

Life in the twenty-first century

The World Future Society is a group of people from more than 80 countries who are interested in how modern technology is making our world better, and who write reports about how it will change our lives.                                                                                                                                            The things that we will be able to do in the twenty-first century (since the year 2000) should help us live better lives in many ways, at home and at work, in our own country and around the world. Here are just some of them, put into five groups.

People

People may live for up to 120 years and use new technology to help when people go blind, deaf and have other problems. The number of people over a hundred years old could go from 135,000 today to 2.2 million people by 2050. By 2015 people think that 100 million workers will be able to work from home for a company in a different country by using the Internet.

Money

Worldwide e-business will become even more successful with online shops that sell special products for each person, which will be brought to their house the next day.

Environment

The technology for making energy from wind and the Sun is growing very quickly. In the future wind and Sun energy could become much cheaper and many more countries could use it. This would be very useful in poor countries. The air in big cities would also become much cleaner and healthier as a result.

Society and culture

The Internet will help to create more worldwide friendships. Families may spend more time together as people will be able to do 24-hour online banking and shopping.

Technology      

The new science of “nanotechnology” (very small robots or machines) will make all sorts of products smaller and lighter. Very, very small machines could take away rubbish, make things in factories, and help inside the human body by taking away fat. By 2012 people will be able to wear these small machines that look like watches, which will give them lots of information about their body and keep them healthy.

小题1:What does the World Future Society do?

A.Look at how technology will make people happy.

B.Look at how technology will change the world.

C.Make technology work better for themselves.

D.Make small machines to make us healthier.小题2: How will technology help people?

A.Help all people live for over 120 years.

B.Help disabled people to get jobs.

C.Make people healthier and live longer.

D.Help workers to use the Internet.小题3:How will people go shopping?

A.In special shops.

B.Using the Internet at certain times.

C.Using the Internet any time of the day.

D.Using nanotechnology.小题4: How will technology help the environment?

A.Poor countries will have enough energy.

B.Wind energy will be cheaper than Sun energy.

C.We will not need wind and Sun energy.

D.Wind and Sun energy will be cheaper.小题5:The new science of “nanotechnology” will _______.

A.drive small machines to work for people

B.make good-quality watches

C.allow people to eat more

D.make very small products

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