题型:阅读理解 题类:常考题 难易度:普通
福建省厦门市2020届高中毕业班英语第二次质量检查(6月)试卷
It was a red-letter day in the history of medicine- "Target Zero Day", May 8th, 1980, marking the complete removal of smallpox, a terrifying disease. It was untreatable but, luckily, it turned out that vaccination (接种疫苗) provided good protection一and that mass immunization (免疫) could wipe out the small- pox virus by blocking its spread.
According to legend, vaccination was invented by Dr Edward Jenner. Jenner showed that healthy children vaccinated with cowpox, a mild infection of cattle, could not catch smallpox. He was supposedly inspired by a comment from a local milkmaid, but there is evidence that the idea came from a medical friend, John Fester, who had experimented with cowpox. Nevertheless, Jenner deserves credit for introducing vaccination into the medical mainstream with his paper published in 1798.
In 1966, 160 years after the prediction that vaccination would clean off the disease, the World Health Organization launched its Smallpox Eradication Programme. This heroic 1-year drive was directed by two American public health doctors, DA Henderson and Bill Forge. Their hardships were enormous: One WHO official even promised to eat a tyre if smallpox was removed; Henderson promised to send him the tyre and wished him good appetite. But Henderson and Foege's hard work paid off--three years after the last smallpox case was informed (to make sure no outbreaks had been missed) Target Zero Day was declared.
40 years on, shy should we remember Target Zero Day? First, to celebrate victory of preventative medicine and freedom from a cruel disease. Then, we must remember the victims of smallpox. It had previously killed 1 in 12 worldwide. In 1914, a Canadian professor warned against forgetting smallpox, which was fast disappearing from North America. It went on to kill at least another 250 million people -- three times more than both world wars combined. Target Zero Day also reminds us of undefeated infections, including polio, measles, malaria, and of course the coronavirus Covid-19. Let's recognize Target Zero Day for what it is: a milestone in world history and a monument to the art of the possible.
Your school asked parents about the social development in children in the last Parents' Meeting. Here are some opinions. Read the following information and answer the questions.
Parent 1: Social development in children is an important part of childhood. Social activities can help enhance children's social abilities and make them more confident. | Parent 2: Social development should begin at a very early age. It is important for young children before starting school. Playing with other children can help them get skills needed to make new friends. |
Parent 3: Many ball games are a great way to encourage children to communicate with other kids. It's a good idea for them to play basketball or football together. They can learn teamwork. | School headmaster: Parents should try to allow children to deal with the situation on their own first. Children can learn what works and what doesn't work from their failures, which help children act properly in the future's society. |
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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