问题 解答题

被子植物具有哪些特点,使它们成为地球上分布最广泛的植物类群?

答案

被子植物的种子外面有果皮包被着,被子植物在繁殖的过程中能受到更好的保护,适应环境的能力更强,适于生活在不同的环境中;其次有些果实的表面有翅或毛,适于随风传播;有些果实颜色鲜艳,有香甜的浆液或果肉,能诱使动物来吃,利于播种.因此被子植物是植物界中最高等的一个类群,其种类最多,分布最广.

故答案为:被子植物的种子外面有果皮包被着,被子植物在繁殖的过程中能受到更好的保护,适应环境的能力更强,适于生活在不同的环境中;其次有些果实的表面有翅或毛,适于随风传播;有些果实颜色鲜艳,有香甜的浆液或果肉,能诱使动物来吃,利于播种.

单项选择题
阅读理解

Welcome to the future. It’s year 2050 and Scotland is now powered completely by“clean”energy.

Homes have entire roofs made of solar materials, rooms are kept warm by wallpaper, and people go to and from work in electric and hydrogen( 氢) cars.

Oil is still being found in the North Sea, but it’s not now only used to keep aircraft flying. And a new 500---mile underwater link with Iceland has been built to catch heat from the hot springs. There’s still a role for king coal—but the black diamonds are now environment---friendly. 

People will be able to import the electricity they need and export any excess(超过的量) they make through rooftop windmills(风车). New technology will store electricity better and provide it on demand. Heat exchangers will provide heating and hot water.

Harmful carbon dioxide waste is being piped offshore to St Fergus and from there into some of the remaining oil—producing fields to be stored safely without entering the atmosphere. Gas remains the preferred energy source of industry and is now shipped in liquid form. But hydrogen is imported through pipelines from France and from a geothermal (地热的) plant in Iceland.

Hydrogen—fuelled cars have become popular. Electric bikes are common in cities using the new urban two—wheel network. Electric vehicles have become common, and their performances have been improved because of the developments in electrical drive technology like high—temperature super conducting motors. Many people leave their vehicles in a giant park where they can be recharged from the national electrical system . Oilseed rape (油菜) is widely grown to fuel some motors .

小题1:What does the underlined phrase in paragraph 2 mean ?

A.The hot springs

B.Oil

C.Coal

D.Oil and coal小题2:Which sources of energy play a more important role in people’s daily life in the future ?

A.Oil and coal

B.Hydrogen and gas

C.Electricity and gas

D.Solar energy and wind小题3:The means of transport people use in 2050 do not include__________.

A.windmills

B.electric bikes

C.hydrogen—fuelled cars

D.aircraft小题4:The passage is written to tell us in the future_____________.

A.life will be better and better

B.the energy will become cleaner and cleaner

C.people will use some new sources of energy

D.people will pay more attention to the environment