题型:阅读理解 题类:常考题 难易度:普通
辽宁省辽阳市2017-2018学年高一下学期英语期末考试试卷
Do you want to go abroad to make money? If you've decided to invest(投资)overseas, you may be wondering which countries are the best, and which countries will give you the biggest returns. In some locations, investment is easier than others. Here are the top 4 best countries to invest in housing:
Italy
A charming hillside area, Abruzzo makes for a great investment. This beautiful place has lots of local housing resources, and you can buy a home that needs just $45,000. With proper repair, selling for at least four times that much, you can easily make money.
Argentina
Central America's Argentina's tourism is popular, so it has a lot to offer locals and tourists alike. This coastal country is affordable, too, especially in the busy city of Buenos Aires. As the city is rapidly expanding, now it's time to get this hot investing opportunity.
Mexico
In the south of the border, you can find unbelievable investment. Playa del Carmen will give you the most for your money. Plus its tourism is popular and it's a nice place to visit and easily accessible from the United States.
Panama
Historic and lively, Panama is a safe place for shopping. You'll enjoy great tax(税金)benefits in Panama. Panama does not charge income tax for the first 10 years of your investment.
No matter where you choose to buy, these four countries will provide you with a great location and return on investment.
Hot Air Balloons
| A hot air balloon is made up of 3 main parts:
The Envelope The actual fabric balloon which holds the air.
The Burner The unit which pushes the heat up into the envelope
The Basket Where the passengers and pilot stand |
The basis of how the balloon works is that warmer air rises in cooler air. This is because hot air is lighter than cool air as it has less mass per unit of volume. Mass can be defined by the measure of how much matter something contains. The actual balloon has to be large as it takes a large amount of heated air to lift it off the ground.
The burner uses propane gas to heat up the air in the envelope to move the balloon off the ground and into the air. The pilot must keep firing the burner at regular intervals throughout the flight to ensure that the balloon continues to the stable. Naturally, the hot air will not escape from the hot at the very bottom of the envelop as firstly, hot air rises and secondly, the floating power keeps it moving up.
To move the balloon upwards, the pilot opens up the propane value which lets the propane flow to the burner which in turn frees the flame up into the envelope. It works in much the same way as a gas grill: the more you open the valve, the bigger the flame to beat the air and the faster the balloon rises.
The “Parachute Valve” at the very top of the balloon is what is used to bring the balloon down towards the ground. It is a circle of fabric cut out of the top of the envelop which is controlled by a rope which runs down through the middle of the envelope to the basket. If the pilot wants to bring the balloon down, he or she simply pulls on the rope which will open the valve, letting hot air escape, decreasing the inner air temperature. This cooling of air causes the balloon to slow its rise.
The pilot can operate horizontally by changing the vertical position of the balloon because the wind blows in different directions at different altitudes. If the pilot wants to move in a particular direction, he or she simply arises and falls to the appropriate level and rides with the wind.
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