Today we visit a small museum in the American state of Maryland.    1    is called the National Cryptologic Museum(国家密码博物馆). There you will find information that    2    (be)once secret. The National Cryptologic Museum is on Fort George G. Meade, a military base near Washington, D. C. It tells not only the story of cryptology but also the men and women    3    have worked in this    4    (usual) profession.

The word cryptology comes    5    the Greek "kryptos logos". It means "hidden word".

Cryptology is writing or communicating in ways    6    (design) to hide the meaning of your words.    7    museum has many examples of equipment that was once used to make information secret. It also has equipment that was developed to read secret    8    (message). The method of hiding exact meanings    9    (call) coding. People have used secret codes throughout history     10     (protect) important information.

【推荐2】Styrofoam is plastic     1     a bad reputation.

It cannot be recycled without releasing (释放) dangerous pollutants into the air. The U. S. Environmental Protection Agency     2     (say) it is the fifth largest creator of dangerous waste.

Scientists from the U. S. and China have discovered that mealworms can digest plastic. One mealworm can digest a pill-sized amount of plastic a day.

Study co-author Wei-Min Wu says that in 24 hours, the plastic     3    (turn) into carbon dioxide.

Are the worms hurt by     4    (eat) plastic? The study found that worms eating Styrofoam were as     5     (health) as worms eating bran (糠).

Styrofoam is a lightweight material, about 95 percent air, with very good insulation properties (绝缘性), according to Earthsource.org. It is used in products from     6     (cup) that keep your drinks hot or cold to packaging materials     7     protect items during shipping.

“Solving     8     problem of plastic pollution is important. Landfill space is becoming limited,” says Wu, a Stanford University environmental engineering instructor.

About 33 million tons of plastic are thrown away in the United States every year. Plastic plates, cups and containers take     9     25 percent to 30 percent of space in America’s landfills. One Styrofoam cup takes more than 1 million years     10     (recycle) in a landfill, according to Cleveland State University.

In most big cities, it is easier     1     (hire) a taxi at a moment’s notice when the weather is good. But when it’s raining, people have a much harder time finding one. One obvious reason is that many people     2     walk short distances during good weather prefer to take a taxi in the rain. Therefore, taxis tend to be more fully filled on     3     (rain) days. Besides, the supply of available taxis is also smaller because taxi drivers can     4     (easy) reach the target fares and go home early.