Read the article and select the best answer. Article: Edmund Halley was an English scientist who lived over 200 years ago. He studied the observations of comets which other scientists had made. The orbit of one particular comet was a very difficult mathematical problem. He could not figure it out. Neither could other scientists who dealt with such problems. However, Halley had a friend named Isaac Newton, who was a brilliant mathematician. Newton thought he had already worked out that problem, but he could not find the papers on which he had done it. He told Halley that the orbit of a comet had the shape of an ellipse . Now Halley set to work. He figured out(,)the orbits of some of the comets that had been observed by scientists. He made a surprising discovery. The comets that had appeared in the years 1531, 1607, and 1682 all had the same orbit. Yet their appearance had been 75 to 76 years apart. This seemed very strange to Halley. Three different comets followed the same orbit. The more Halley thought about it, the more he thought that there had not been three different comets as people thought. He decided that they had simply seen the same comet three times. The comet had gone away and had come back again. It was an astonishing idea! Halley felt certain to make a prediction of what would happen in the future. He decided that this would appear in the year 1758. There were 53 years to go before Halley's prediction could be tested. In 1758 the comet appeared in the sky. Halley did not see it, for he had died some years before. Ever since then that comet had been called Halley's comet, in his honor. Question: Halley made his discovery _ . Options: A: by doing experiments B: by means of his own careful observation C: by using the working of other scientists D: by chance
C

(Question)
Read the article and select the best answer. Article: Are we getting more stupid? According to Gerald Crabtree, a scientist at Stanford University in the US, we are. You may not want to hear this, but Crabtree believes that human intelligence reached its peak more than 2,000 years ago and ever since then has been going downhill. "If an average Greek from 1,000 BC were transported to modern times, he or she would be one of the brightest among us," Crabtree told The Guardian. At the heart of Crabtree's thinking is a simple idea. In the past, intelligence was critical for survival when our ancestors had to avoid dangerous animals and hunt for food. The difference of being smart or stupid is often life or death. However, after the spread of agriculture, when our ancestors began to live in dense farming communities, the need to keep their intelligence in peak condition gradually reduced. This is not hard to understand. Most of the time, pressure is what keeps us going - you need the pressure from your teachers to finish your homework; the pressure of looking pretty prompts you to lose weight when summer comes. And the same is also true of our intelligence - if we think less, we become less smart. These mutations are harmful to our intelligence and they were all developed in the past 3,000 years. The other evidence that Crabtree holds is in our genes. He found that among the 2,000 to 5,000 genes that we have that determine human intelligence , there are two or more mutations in each of us. However, Crabtree's theory has been criticized by some who say that early humans may have better hunting and surviving abilities, but people today have developed a more diverse intelligence. For example, spearing a tiger doesn't necessarily require more brainpower than playing chess or writing a poem. Moreover, the power of modern education means a lot more people have the opportunity to learn nowadays. "You wouldn't get Stephen Hawking 2,000 years ago. He just wouldn't exist," Thomas Hills of the University of Warwick, UK, told Live Science. "But now we have people of his... Question: What is Crabtree's recent finding according to the article? Options: A: The Greeks from 1,000 BC could have been the smartest in human history. B: Our ancient ancestors had no better surviving abilities than we do nowadays. C: Humans have been getting steadily more intelligent since the invention of farming. D: Mutations in genes that decide human intelligence have affected the development of intelligence.
(Answer)
D

Ques: Read the article and select the best answer. Article: By today's standards, my mobile phone is pretty rubbish. It's a Nokia 1616. If that doesn't mean much to you ( it's not the kind of phone you see advertised on television) ,all you need to know is that it's a small, not very heavy device with which you can send and receive telephone calls and text messages. It also has a very handy torch on the top for when you can't find your keys, or when you drop something on the floor in the cinema. Apart from that, my phone doesn't do much. Well, it has an alarm, and it probably has a calculator and things like that, but it's nothing compared to a smartphone. Why would I want one of those? I have often been told that the big advantage of having a smartphone is that " you can do everything with them!" But when was the last time you saw someone doing "everything" with a smartphone? Okay, so they may have an endless list of functions, but generally they are used for checking social networking sites, playing games, and receiving and replying to emails. I'm happy just doing all of those things at home on my laptop. As far as I can tell, the best thing about having a smartphone is that you can be connected to the internet all the time. Don't get me wrong, I love the internet, but I just don't see the point of constantly being online. I can't remember the last time I received a Facebook update which was so urgent that I had to read it as soon as it appeared, and I can't imagine ever having a job which was so important that I would need to read work-related emails immediately. I would think that if someone needed me urgently, they would just ring me rather than send an email. And my trusty Nokia can manage that. One of the most peculiar effects of the smartphone is, in my opinion, the newly-found addiction to maps and navigation systems. Is there anything more boring than knowing exactly where you are all of the time? How do you get to know an area if you don't get lost there a few times? And if you are dependent on online maps, what happens to those great places you... Question: It can be inferred from the above passage that _ . Options: A: work-related emails should be answered immediately B: a laptop and a smartphone share many functions C: smartphones should always be connected to the net D: a Facebook update is usually very important
Ans:
B