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阅读下面短文,根据文章大意用所给单词的适当形式填空(未提供单词的,限填一词),使文章意思完整、正确。

    Everything about me elephant is big, from its size to how long it takes for a baby elephant to be born. Of all land animals, the elephants have the ____ (large) brain and can talk to each other using their own language. They also have ____ very good memory. They can remember lots of other elephants that they have known and have friends and family the same way humans do. They will get very sad ____ one dies and they help family members when they are sick or hurt.

    In India and Africa they ____ (use) for transportation and to carry tourists around animal parks. Elephants are different ____ many other animals because they are very kind and care about humans. They are gentle and kind and don't hurt anyone. They will only fight to protect ____ (they). There is a story of an ____ (India) king who died and for over 30 years his favourite elephant was very sad and would not do anything.

    And how do we humans treat elephants? For ____ (thousand) of years elephants have been treated very ____ (bad) and killed by humans. Although there is an international agreement to stop the ivory (象牙) from being sold, people still shoot and kill elephants to get their tusks. In fact, in 20 years there might not be any elephant left on Earth. So it is important for us ____ (save) the elephants before it's too late.

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    See a cell phone cover that you like on Taobao? Forget about placing an order, paying the bill online and waiting for days for it to be delivered to you. In the near future, you'll be able to get it in minutes just by hitting "print" on your computer. You might find it hard to believe that you could actually "print" an object as you would a picture. But it is not that hard to understand how it would work. Just as a traditional printer sprays (喷) ink onto paper line by line, modem 3-D printers spread material onto a surface layer by layer, from the bottom to the top, gradually building up a shape.

    Instead of ink, the materials the 3-D printer uses are mainly plastic, resin (树脂) and certain metals. The thinner each layer is — from a millimeter to less than the width of a hair —the smoother and finer the object will be. This may sound like a completely new technology, but the truth is that 3-D printing has been around since the late 1980s. Back then, it was barely affordable for most people, so few knew about it.

    Last year, though, saw a big change in the 3-D printing industry — printers became much cheaper. For example, 10 years ago a desktop 3-D printer might have cost £20,000, while now they cost only about £ 1,000, according to the BBC. Taken out of the factory and introduced to more diverse and common uses, 3-D printing can create just about anything you can think of --- flutes (笛子), bikinis, jewelry, aircraft parts and even human organs. In fact, scientists from Cornell University in New York have just made an artificial ear using a 3-D printer, according to Science Daily. The fake ear looks and acts exactly like a natural one.

    However, as 3-D printing becomes more common, it may bring about certain problems —such as piracy. "Once you can download a coffee maker, or print out a new set of kitchen utensils (餐具) on your personal 3-D printer, who will visit a retail (零售的) store again?", an expert in 3-D printing told Forbes News. Even more frightening, what if anyone in the world could use a 3-D printer to print out a fully functioning gun?