As they migrate , butterflies and moths choose the winds they want to fly with, and they change their body positions if they start floating in the wrong direction. This new finding suggests that insects may employ some of the same methods that birds use for traveling long distances. Scientists have long thought that insects were simply at the mercy of the wind. Fascinating as their skills of flight are, migrating behavior has been difficult to study in insects because many long distant trips happen thousands of feet above ground. Only recently have scientists developed technologies that can detect such little creatures at such great heights. To their surprise, though, the insects weren't passive travelers on the winds. In autumn, for example, most light winds blew from the east, but the insects somehow sought out ones that carried them south and they positioned themselves to navigate directly to their wintering homes. Even in the spring, when most winds flowed northward, the insects didn't always go with the flow. If breezes weren't blowing in the exact direction they wanted to go, the insects changed their body positions to compensate . Many migrating birds do the same thing. The study also found, butterflies and moths actively flew within the air streams that pushed them along. By adding flight speeds to wind speeds, the scientists calculated that butterflies and moths can travel as fast as 100 kilometers an hour. The findings may have real-world applications. With climate warming, migrating insects are growing in number. Knowing how and when these pests move could help when farmers decide when to spray their crops. Scientists originally thought that _ . A) insects always waited for their favorable winds B) insects chose the winds they wanted to ride C) insects were just blown about by the wind D) insects positioned themselves in the winds
C
(Question)
Scientists from the University of East Anglia have identified four new man-made gases that are contributing to the damage to the ozone layer. Two of the gases are accumulating at a rate that is causing concern among researchers. Worries over the growing ozone hole have seen the production of chlorofluorocarbon (CFC) gases restricted since the mid 1980s. But the precise origin of these new, similar substances remains a mystery. Lying in the atmosphere, the ozone layer plays a critical role in blocking harmful UV rays, which cause cancers in humans and reproductive problems in animals. Scientists from the British Antarctic Survey were the first to discover a huge "hole" in the ozone over Antarctica in 1985. The evidence quickly pointed to CFC gases, which were invented in the 1920s, and were widely used in refrigeration. Extraordinarily, global action was rapidly agreed to deal with CFCs and the Montreal Protocol to limit these substances came into being in 1987. A total global ban on production came into force in 2010. Now, the newly discovered four new gases can destroy ozone and are getting into the atmosphere from as yet unidentified sources. Three of the gases are CFCs and one is a hydrochlorofluorocarbon (HCFC), which can also damage ozone. The research has shown that four gases were not around in the atmosphere at all until the 1960s, which suggests they are man-made. The scientists discovered the gases by analyzing polar snow pack. Air from this snow is a natural archive of what was in the atmosphere up t0 100 years ago. The researchers also looked at modern air samples, collected at remote Cape Grim in Tasmania. They estimate that about 74,000 tonnes of these gases have been released into the atmosphere. Two of the gases are accumulating at significant rates. However, they don't know where the new gases are being released from and this should be investigated. Possible sources include chemicals for insecticide production and solvents for cleaning electronic... What will the scientists probably attempt to do about the gases next? A) Find out what can replace things like insecticides and put them into use. B) Find out how they destroy ozone and get rid of those in the atmosphere. C) Find out where they are exactly from and stop them from being released. D) Find out if HCFC is more harmful than CFCs and take proper measures.
(Answer)
C
Ques: Barefoot Traveler is a tour agent that specializes in diving holidays,tailor-made to your own needs.The most popular destinations include Bonaire,Tobago,the Bahamas, Maldives,Oman,Seychelles and Thailand. Our friendly and knowledgeable staff,who are qualified divers themselves,will be able to advise you on the best destinations for your requirements. Whether you want to learn to dive,further your diving qualifications,continue to discover the underwater world,or simply relax on the beach,we are here'to help organize your holiday. We are happy to satisfy single travelers and offer special discounts . Group discounts are offered to groups of eight or more travelers and tailor-made packages are available for Dive Clubs. We also offer a series of diving liveaboard choices throughout the Caribbean.Indian Ocean and South East Asia.Liveaboards are very popular scuba diving holidays for those who want to access the best diving sites. Our barefoot luxury holiday brand is for those trying something a little more special,whether it's your honeymoon,anniversary or simply for more discerning travelers.We have a selection of 4 and 5 star levels which are the best in luxury holidays. According to the passage,Barefoot Traveler _ . A) is not a tour agent B) has over 25 scuba diving liveaboard beats C) makes the luxury holiday based on consumers'needs and desires D) makes the luxury holiday you don't have in mind
Ans: C
Angkor Wat (City Temple) is a vast temple complex near Siem Reap, about 200 miles from the capital of Phnom Penh in Cambodia. After the city of Angkor fell to invaders, Angkor Wat fell into the jungle but continued as a Buddhist temple and a pilgrimage site over the centuries. Angkor Wat is the best preserved example of Khmer architecture in Cambodia and is so grand in design that some rank it among the Seven Wonders of the World. It appears on the Cambodian national flag, a very rare instance of a flag incorporating an image of a building. The "lost city" of Angkor first attracted the interest of Europeans in the 1800s after Cambodia was colonized by the French. In addition to many tourists, Buddhist monks are daily visitors to Angkor Wat, their bright orange robes making a vivid contrast with the grey stone of the temple. The city of Angkor was capital of the Khmer Empire from the 9th to the 15th centuries. The city of Angkor was founded on political and religious ideas adapted from India, and the temples of Angkor were intended as a place of worship for the king. Angkor Wat was built by King Suryavarman II in the 12th century as a vast funeral temple that would hold his remains, and as a royal temple dedicated to a Hindu God. During its six centuries as imperial capital, Angkor went through many changes in architectural styles and in religion. By the late 13th century, the once crazy pace of Angkor's architectural pursuits had begun to die down, and a more restrained type of religion was on the rise under the growing influence of Theravada Buddhism. At the same time, Angkor and Khmer Empire were increasingly threatened and attacked by invading armies. By the 16th century , the golden age of Angkor was over and many of the great temples began to recede into the jungle. From the 15th to 19th centuries, Theravada Buddhist monks cared for Angkor Wat, and it is thanks to them that the temple remains mostly intact. Angkor Wat became one of the most important pilgrimage sites in Southeast Asia. Angkor Wat was ranked among the Seven Wondersof the World because of _ . A) its big size B) its grand design C) its religious ideas D) its royal style
B