题目内容
Turn on CCTV-2 and you ____ advertisements showing happy families.
A. will often see B. often see C. are often seeing D. have often seen
A
Hi guys! I’m Lucy the ladybird and while I’m very much of a lady, I’m not actually a bird but a glowing red bettle(甲虫)with decorative black spots.
I’m a friendly little bug, to be honest, and simply like to be close with my pals as long as they handle me very gently. I don’t bite humans but I do sink my teeth into aphids (蚜虫) which, unlike me, are very harmful to all the plants. I milk the aphids just like people do with cows and I milk them dry of all the sap (汁) they have got from your poor plants. I’m a real gardeners’ friend and love helping out around the place by pollinating (授粉) flowers, tidying up plants’ fallen leaves and helping to turn them into nice rich fertilizer to feed everything both above and below the soil, and naturally, being so attractive to look at, we are perfect living garden decorations.
One thing I can not tolerate is all that poisonous pollution from vehicles, garbage burning and other environmentally unfriendly acts that occur in the cities every single minute of the day and night. Pollution of any kind really chokes me to death, so these days, I only live in clean countryside areas, particularly cool ones where it rains and everything grows fresh and green from spring right through to autumn. In winter, when the weather is too cold for me to bear, then I find a nice place to sleep until the snow has gone and I can come back out to play.
Oh! I almost forgot to tell you that although I am not a bird I do have wings and can fly for short distances. So if you pick me up and let me run up and down your hands and arms, then please don’t frighten me by screaming if I suddenly decide to take off!
【小题1】What makes Lucy the Ladybird suffer most?
A.Heavy rains. | B.Cold weather. |
C.Air pollution. | D.Aphids. |
a. its appearance b. its influence on plantsw8G
c. its habitat d. its food
e. the origin of its name
A.a; c | B.a; b; c | C.a; b; d; e | D.a; b; c; d |
A.It belongs to the insect family. |
B.It does harm to all growing plants. |
C.It lives on the liquid of plants. |
D.It can fly a long distance. |
A.a self –introduction by a lady named Lucy |
B.description of a ladybird’life |
C.letter of praise for a gardener |
D.a speech made by a woman on ladybirds |
Scientists have not come close to understanding all the different kinds of life on the planet, but US researcher Craig Venter is already working on creating the first artificial life.
Venter and his researchers made a breakthrough this August. They successfully moved the DNA of one type of bacteria(细菌) to a yeast(酵母) cell, changed it, then put it into another bacterial cell.
“Bacteria have systems that protect them from foreign DNA,” Venter explained to the BBC. In the experiment, the team managed to block this system.
The experiment was performed on a simple type of bacteria called Mycoplasma mycoides. The team took the bacteria’s genes and put them into a yeast cell.
Putting the DNA in a yeast cell allowed the team to change the genes----in this case, taking out a gene that was not necessary for the bacteria to live.
They then put the gene into a host bacteria cell. The cell went on to divide normally, producing new healthy bacteria.
In January, the team created artificial genes of a new type of bacteria. Their next goal is to put the artificial DNA into a host cell to create a new species, according to a report in Science magazine.
“If we don’t make any errors, I think it should work and we should have the first artificial species by the end of the year,” Venter said in the report.
The first artificial life from is likely to be a simple man-made bacteria, to prove that the technology can work. But that form will be followed by more complex bacteria that turn coal into cleaner natural gas, or algae that can take in carbon dioxide and change it into fuel.
Many scientists think it’s good news to have this artificial life, but others are worried that the technology to create new organisms might end up in the wrong hands, with dangerous results.
【小题1】Craig Venter and his team are working to ______.
A.create a new animal |
B.clone a new species |
C.produce the first artificial bacteria |
D.develop a new system |
a. A gene was removed and put into a host bacteria cell.
b. The genes were put into a yeast cell.
c. The cell produced new healthy bacteria.
d. The genes were changed.
e. Some genes were taken out of Mycoplasma mycoides.
A.d-e-a-c-b | B.e-b-d-a-c |
C.a-d-e-c-b | D.b-e-d-c-a |
A.cure deadly diseases |
B.prepare the Earth for natural disasters |
C.prove that the technology can work |
D.improve the earth’s environment |
A.Venter and his team are the only scientists trying to create artificial life |
B.The experiment was based on research into different kinds of life on Earth |
C.A new type of bacteria was created in January |
D.All scientists are not in favor of the research |