Ques: Read the article and select the best answer. Article: Around 200 million years ago, the earth was 18 degrees warmer than it is now. That might be a bit hot for humans, but it was just right for the giant dinosaurs that wandered about the earth during the Mesozoic era. A new study found that planteating dinosaurs may have contributed to the warming of the earthby releasing significant amounts of methane . The study, published in science journal Current Biology, focused on sauropods, longnecked herbivores that munched on the top of trees. They were the largest of the dinosaurs; food broke down in their stomachs for long periods of time. The researchers estimate that a sauropoda released 2,675 liters of methane per day--adding up to a large amount of the greenhouse gas being pumped from dinosaur's gut into the atmosphere. Plant eaters naturally release methane as part of their digestive process. The larger the animal, the more methane it produces. Methane, a greenhouse gas, traps heat and remains in the atmosphere for approximately 915 years, which warms the atmosphere. Today, some animals, such as cattle, goats and sheep, produce large amounts of methane as a byproduct to their food digestion. Methane is also released from human--influenced sources such as landfill, agricultural activities, coal mining and other industrial practices--which all contribute to today's climate change, according to the Environmental Protection Agency. The researchers estimate that earth's sauropods would have produced about 520 million tons of methane per year--similar to the total amount of methane produced today by natural and manmade sources. However, the researchers warn that their numbers are estimates based on multiple assumptions about the digestive systems and populations of dinosaurs. The author of the study David Wilkinson says the emission of methane from dinosaurs would have been just one of the causes of warm climate during the Mesozoic era. Other causes include gases produced from volcanoes, swamps, shallow seas and so on. Still,... Question: Scientists think dinosaurs may have led to the global warming because _ . Options: A: they ate everything they found B: they usually had a good appetite C: they released a lot of methane D: there were too many dinosaurs on earth
Ans: C

Ques: Read the article and select the best answer. Article: When people talk of a virus these days, chances are that they are talking about computer virus that have the power wipe out all the valuable work people may have stored in their computers. Imagine, the virus has the power to make military systems, giant banks, airports, hospitals and traffic system come to stop! What does a computer virus do? It targets electronic objects that are programmed. The virus spreads through connections between these electronic objects. For virus spreading experts, e-mail is a favorite method of sending their destructive weapon. But scientists warn that this is not the worst that can happen. There is more. People are also connected through phones. The next virus may actually target mobile phones, especially those that are programmed to do many tasks apart from just communicating. It would then be easy for a virus to infect those programs and create major disorder. For example, these virus may have the power to record your phone conversations and make others hear them. They create problems with your electronic money accounts, or they could create a mountain of telephone bills for calls you never made. And that would be a disaster. A report on this was published in the New Scientist recently. One way out would be to have simpler phones with not so many different functions. This would mean there would mean there would be fewer programs for the virus to attack. But mobile phone producers are _ . People on longer want an electronic item to perform just one task. They want more and more functions added. That would mean more software programs to make the mobile phone perform all those functions. And that means the possibility of more viruses. Question: It can be inferred from the passage that _ . Options: A: computer viruses are not so as destructive as mobile phone viruses B: people should be careful when receiving e-mails C: people find it difficult to use electronic equipment correctly D: having electronic money accounts brings people a lot of convenience
Ans: B

Ques: Read the article and select the best answer. Article: United States President George W. Bush is expected to issue a directive in the next few weeks. It will give the US Air Force a green light for the development of space weapons, US media reported last week. This would potentially start a new global arms race, some experts have warned. To keep that from happening, last Wednesday the White House explained that it was not considering putting weapons in space. It said it was making a shift in US space policy to allow for protection of satellites. But some defense analysts and arms control advocates argue that the policy will pave the way for the US to put both defensive and offensive weapons in space. "No one should be fooled," said Theresa Hitchens, an American weapons expert. The US is now restricted by a 1996 directive signed by President Bill Clinton. Plans for space weapons were vetoed by the Clinton cabinet. The directive emphasized the peaceful use of space , in agreement with almost unanimous global opinion. The US military has placed importance on space and has sent up numberous satellites for troop communications and to provide intelligence and data to guide bombs to their targets. The US Air Force wants to develop space- based weapons that could strike targets anywhere in the world within 90 minutes of receiving the order to open fire. These new weapons under development cover a wide range. They include hunter- killer satellites and orbiting weapons. And they use lasers, radio waves, or even dense metal tubes, known as " Rods from God", dropped from space to do the damage. There are many barriers to the setting up of this kind of program, experts say. First is the coast. It is estimated that the budget may be US $220 billion to US $ 1 trillion . The technical difficulties of developing reliable space weapons are also a problem. And, the program will draw strong criticism from around the world. Experts worry about starting a space arms race. Question: After reading this passage, it can be inferred that " _ ". Options: A: George W. Bush's directive to be issued will be against global opinions B: The White House is right in explaining that US new space policy aims to protect satellites C: US government has little difficulty in developing new space weapons D: President George W. Bush and Bill Clinton share a lot in common
Ans:
A