2 . Each year, the world loses about 10 million hectares of forest—at area about the size of Iceland — because of cutting down trees. At that rate, some scientists predict the world’s forests could disappear in 100 to 200 years. To handle it, now researchers at Massachusetts Institute of Technology (MIT) have pioneered a technique to generate wood-like plant materials sin a lab. This makes it possible to “grow” a wooden product without cutting down trees.

In the lab, the researchers first take cells from the leaves of a young plant. These cells are cultured in liquid medium for two days, then moved to another medium which contains nutrients and two different hormones (激素). By adjusting the bormone levels, the researchers can tune the physical and mechanical qualities of the cells: New the researchers use a 3D printer to shape the cell-based material, and let the shaped material grow in the dark for three months. Finally, the researchers dehydrate (使脱水) the material, and then evaluate its qualities.

They found that lower bormone levels lead to plant materials with more rounded, open cells of lower density (密度), while higher hormone levels contribute to the growth of plant materials with smaller but denser cell structures. Lower or higher density of cell structures makes the plant materials softer or more rigid, helping the materials grow with different wood-like characteristics. What’s more, it’s to be noted that the research process is about 100 times faster than the time it takes for a tree to grow to maturity!

Research of this kind is ground-breaking. “This work demonstrates the great power of a technology,” says lead researcher, Jeffrey Berenstab. “The real opportunity here is to be at its best with what you use and how you use it. This technology can be tuned to meet the requirements you give about shapes, sizes, rigidity, and forms. It enables us to grow’ any wooden product in a way that traditional agricultural methods can’t achieve.”

3 . The latest in cat research reveals that the lovely animal seems to have a basic grasp on both the laws of physics and the ins and outs of cause and effect.

According to a newly published study, cats seem to be able to predict the location of hiding prey (猎物) using both their ears and an in born (天生的) understanding of how the physical world works. In a recent experiment, Japanese researchers taped 30 domestic cats reacting to a container that a team members hook. Some containers rattled (发出响声); others did not. When the container was tipped over, sometimes an object fell out and sometimes it didn’t.

It turns out that the cats were remarkably smart about what would happen when a container was tipped over. When an object did not drop out of the bottom of a rattling container, they looked at it for a longer time than they did when the container behaved as expected.

“Cats use a causal-logical understanding of noise or sounds to predict the appearance of invisible objects,” lead researcher Saho Takagi says in a press release. The researchers conclude that cats’ hunting style may have developed based on their common-sense abilities to infer where prey is, using their hearing.

Scientists have explored this idea with other endearing creatures: babies. Like cats, babies appear to engage in what’s called “preferential looking”—looking longer at things that are interesting or unusual than things they perceive as normal.

When babies’ expectations are violated in experiments like the ones performed with the cats, they react much like their animal friends. Psychologists have shown that babies apparently expect their world to comply with the laws of physics and cause and effect as early as two months of age.

Does the study mean that cats will soon grasp the ins and outs of cause and effect? Maybe. Okay, so cats may not be the next physics faculty members at America’s most important research universities. But by demonstrating their commonsense, they’ve shown that the divide between cats and humans may not be that great after all.

4 . For several days I saw little of Mr. Rochester. In the morning he seemed much occupied with business, and in the afternoon gentlemen from the neigh our hood called and sometimes stayed to dine with him. When his foot was well enough, he rode out a great deal.

During this time, all my knowledge of him was limited to occasional meetings about the house, when he would sometimes pass me coldly, and sometimes bow and smile. His changes of manner did not offend me, because I saw that I had nothing to do with the cause of them.

One evening, several days later, I was invited to talk to Mr. Rochester after dinner. He was sitting in his armchair, and looked not quite so severe, and much less gloomy. There was a smile on his lips, and his eyes were bright, probably with wine. As I was looking at him, he suddenly turned, and asked me, “do you think I’m handsome, Miss Eyre?”

The answer somehow slipped from my tongue before I realized it: “No, sir.”

“Ah, you really are unusual! You are a quiet, serious little person, but you can be almost rude.”

“Sir, I’m sorry. I should have said that beauty doesn’t matter, or something like that.”

“No, you shouldn’t! I see, you criticize my appearance, and then you stab me in the back! You have honesty and feeling. There are not many girls like you. But perhaps I go too fast. Perhaps you have awful faults to counterbalance your few good points.”

I thought to myself that he might have too. He seemed to read my mind, and said quickly, “Yes, you’re right. I have plenty of faults. I went the wrong way when I was twenty-one, and have never found the right path again. I might have been very different. I might have been as good as you, and perhaps wiser. I am not a bad man, take my word for it, but I have done wrong. It wasn’t my character, but circumstances which were to blame. Why do I tell you all this? Because you’re the sort of person people tell their problems and secrets to, because you’re sympathetic and give them hope.” It seemed he had quite a lot to talk to me. He didn’t seem to like to finish the talk quickly, as was the case for the first time.

“Don’t be afraid of me, Miss Eyre.” He continued. “You don’t relax or laugh very much, perhaps because of the effect Lowood school has had on you. But in time you will be more natural with me, and laugh, and speak freely. You’re like a bird in a cage. When you get out of the cage, you’ll fly very high. Good night.”

Global warming could make humans shorter, warn scientists who are said     1     (find) evidence that it caused the world’s first horses to shrink nearly 50 million years ago.

In fact a team from the universities of Florida and Nebraska says it has found a link between the earth     2     (heat) up and the size of mammals—horses. The scientists used fossils to follow the evolution (进化) of horses from their earliest     3     (appear) 56 million years ago.

“As temperatures went up,    4     (they) size went down, and vice versa; at one point they were as small as a housecat,” said Dr. Jonathan Bloch, curator of the Florida Museum of Natural History. The scientists say that the current warming could have the same influence     5     mammals — and could even make humans     6     (small).

Horses    7     (start) out small, about the size of a small dog like a miniature schnauzer.     8     is surprising is that after they first appeared, they then became even smaller and then     9     (drama) increased in size, and that exactly agrees with the global warming event. “It had been known that mammals were small when it was warm,     10     we hadn’t understood that the temperature really was driving the evolution of body size,” Dr. Bloch said in the Science journal.

9 . ◆What Are We Talking About?

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