Q: Read the article and select the best answer. Article: "You know, Chihuahuas aren't actual dogs. They're a kind of fox," announced a woman at a party. This woman entirely believed that Chihuahuas are the descendants of the Fennec fox. Many people might believe this: Chihuahuas are similar to foxes in their appearance with long-haired Chihuahuas appearing almost indistinguishable from their wild counterparts . The idea that Chihuahuas are related to foxes isn't uncommon. Even the American Kennel Club, which is usually a highly respected source of information, accepts the belief and the similarity between Chihuahuas and Fennec foxes. Interesting as it is to imagine that Chihuahuas are a breed of the fox, this idea simply can't hold water. Chihuahuas are, in fact, far more closely related to dingoes or wolves than they are to Fennec foxes. Like other dogs, Chihuahuas are able to breed with other members within the same species. The Fennec fox is a member of a different species. Chihuahuas and Fennec foxes are fairly distantly related just like a cat and a tiger are. Their similarities occur only because of a phenomenon known as convergent evolution , in which animals develop similar features to meet similar biological needs. A simple observation of geography further denies the idea that Fennec foxes and Chihuahuas are related. While the Fennec fox was living in the deserts of Africa, the Chihuahua came from Mexico, where it got its common name. Its closest living s are other native Central and South American breeds. Its ancestor, the now nearly-extinct Mexican gray wolf, is also a much closer to the Chihuahua than any other fox. It is common to consider the cute Chihuahua as a little Fennec fox adapted to life, but this theory is not true. Chihuahuas are domestic dogs to the same degree as other dogs. Much as a Chihuahua might look like a fox, it is--and always will be--a dog. Question: Why did the woman say Chihuahuas are a kind of fox? Options: A: They are a breed of the special fox. B: They partly have the features of foxes in appearance. C: Their ancestor is the Fennec fox in fact. D: Their habits are just like those of foxes.
A: B

Q: Read the article and select the best answer. Article: Many people believe the glare from snow causes snowblindness. Yet, with dark glasses or not, they find themselves suffering from headaches and watering eyes, and even snowblindness ,when exposed to several hours of" snow light". The United States army has now determined that glare from snow does not cause snowblindness in troops in a snow -covered country. Rather ,a man's eyes frequently find nothing to focus on in a broad space of snow- covered without- grass land. So his gaze continually moves and jumps back and forth over the entire landscape in search of something to look at. Finding something, hour after hour, the eyes never stop searching and the eyeballs become tired and the eye muscles ache. Nature makes up for this discomfort by producing more and more fluid which covers the eyeball. The fluid covers the eyeball in increasing quantity until it makes eyes difficult to see dearly, and the result is total, even though for a short time, snowblindness. Experiments led the Army to a simple method of overcoming this problem. Scouts ahead of the troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow - covered landscape. Even the scouts themselves throw lightweight, dark - colored objects ahead on which they can focus too. The men following can then see something. Their gaze is arrested. Their eyes focus on a bush and having found something to see, stop searching the snow -blanketed landscape. By focusing their attention on one object at a time. the men can cross the snow without becoming hopelessly snowblind or lost. In this way the problem of crossing a continuous white land is overcome. Question: Snowblindness can be avoided _ . Options: A: by moving one's gaze back and forth B: by walking ahead and keeping looking around C: by making up for the discomfort of one's eyes D: by providing the eyes with something to focus on
A: D

Q: Read the article and select the best answer. Article: The Lionfish Invasion! Lionfish are popular saltwater aquarium fish all over the world, especially in the United States. Nowadays, they also live in Atlantic waters off the East Coast of the United States. These lionfish are what scientists call an invasive species or an "alien invader." Local divers off the coast of North Carolina were not expecting to see what they found one day in August 2002--the beautiful lionfish, common to the warm waters of the western Pacific, but unknown of the Carolina coast. They provided the first solid evidence that lionfish were in the Atlantic. A year later, scientists documented 19 lionfish sightings at eight locations along the North Carolina continental shelf. Then, lionfish were observed off the coasts of Florida, Georgia, and South Carolina, and even as far north as Long Island, New York! Between 2000 and 2003, lionfish sightings were reported at 16 different shipwrecks and natural hard bottom locations. During a summer 2004 research expedition, NOAA(The National Oceanic and Atmospheric Administration) scientists collected 155 lionfish at 19 different locations off the North Carolina coast alone. The jump in numbers and distributions over such a short time strongly indicates that the lionfish is reproducing in the Atlantic Ocean. If this is true, it's the first time that a western Pacific fish has populated the U.S. Atlantic coast. These lionfish were likely released on purpose when people no longer wanted them! The swift and warm Gulf Stream, which transported the floating lionfish eggs from Florida northward, helped the lionfish's Atlantic journey. In Florida waters and along the continental shelf near the Gulf Stream the temperatures are very similar to the lionfish's native waters. However, from north Florida upward, the waters along the coastline are too cold in the winter for lionfish to survive. Scientists expect them to survive the winter only at water depths greater than 120ft because this is where the Gulf Stream has influence all year long. Very... Question: Scientists call the lionfish an "alien invader" because the lionfish _ . Options: A: have damaged the native species B: are able to live in a new environment C: came from one place and spread to another D: will attack other species with their poisonous teeth
A: C