Wherever you look these days, something's looking back at you. There are video cameras on street    1    (corner), vehicles and our own front doors.

A Chicago company    2    (call)Cooler Screens believes that you won't mind if they put cameras into the display cases(展柜)in stores. The cameras aren't placed there    3    (prevent)you from stealing. Instead, they're part of a system that tries to guess    4    you will buy next, based on how you look.

The doors on the cases    5    (be)video screens that show images of the goods, so a customer can see what's available inside. The screens also show vivid ads. They decide which ads to show by    6    (study) video images of the customers.

A camera feeds images of each customer into a computer    7    guesses his or her sex and age.In addition, the system tracks    8    (exact)where the customer is looking. Do the eyes come to rest     9    a bottle of Red Bull, or does the shopper fancy Coca Cola? The Cooler Screens system instantly     10    (analyze)all of this data, and then starts showing ads on the cooler door.

Leather is a hugely popular material for a range of products, but this     1     (popular) comes at a price. The global leather industry kills over a billion animals every year. This     2     (cause) many to ask the question: is it possible to meet the global demand of leather without     3     (do) any harm to animals? A process called biofabrication(生物制作) may be the answer.

Biofabrication is not new; it is already commonly used in medicine. Scientists have applied the technique to grow body parts like ear, skin, and bones for transplants(移植). But it can also     4     (use) to make other products, such as leather. Scientists will be able to make biofabricated leather with whatever qualities they want, such as extra softness, greater strength, or even different colors and patterns.

But how     5     (exact) does biofabrication work?     6     (grow) leather, scientists begin by taking some cells from an animal, not hurting     7     animal in any way. They then set the cells apart and grow them in a lab. This process takes millions of cells and expands them into billions. Next, the scientists take the cells and spread them out to form thin sheets,     8     are then put together to combine into a little     9     (thick) sheets. Anyone can then dye and finish the leather and design it in any way they like.

Andras Forgacs supports biofabrication. He says it may even be a “natural evolution of manufacturing for mankind.” We will be able to make the products we need in an efficient,   responsible,     10     creative way.

China’s Long March 8 rocket set a new record at the Wenchang Space Launch Center in Hainan on Feb 27. It’s the first time the rocket has lifted off with 22 satellites,     1     were later released (释放) in space.

The technology behind a single rocket lifting off with multiple satellites inside is complex (复杂的), as all the satellites must be put     2    (suitable) inside, like “passengers” in a     3    (crowd) vehicle.

The design of the rocket must be such that the satellites inside do not touch or block each other     4     the release process. Also , when the rocket reaches     5    (it) release point the doors must open     6    (let) the satellites come out. The timing     7    (control) so that the satellites have enough time and do not collide (碰撞) with each other. On Feb 27, the 22 satellites were released in 12 rows.

In 1981, China sent three satellites into orbit with one single rocket launch, thus     8    (become) the third country in the world to have mastered the technology. Even today, only five countries and the European Space Agency have the technology.

As we know, the more satellites China can send with a single rocket launch, the more     9    (compete) it will be. This means China still has     10     long way to go in developing “single rocket, multiple satellite” technology.