Read the following article and select the best answer. Article: In spring, you may have seen white foam on a green tree or other plants. As a matter of fact, the foam is where young spittlebugs live. These insects are protected by the foam, and they usually don't do much harm to the plants. As we all know, in late summer, a mother spittlebug lays her eggs on the plant. The babies will hatch in spring. After they come to the new world, they begin to eat juice from the plant. The babies eat more juice than their bodies need for food. The extra juice mixes with a special waste that the spittlebugs produce. When this fluid is released, it mixes with the air, forming bubbly foam. What is so great about having a foam home? The space inside is so wet that it can keep the bugs' soft bodies from drying out. And the foam tastes bad, so it keeps away most animals that would eat the bugs. Some birds will reach their heads through the foam to find the bugs. Wasps and ants might eat them, too. But most of the bugs stay safe inside the foam. Once the bugs have grown into adults, they stop making foam. They leave their homes and jump from plant to plant in search of food. The adults look a little like tiny frogs. For this reason they are also called froghoppers. If you see some foam on a plant, you might want to take a careful look inside. Gently push some of the foam aside with a small stick. Deep inside you may see a few insects eating plant juice. They might also be making more foam. Be sure to push the foam back after a moment to cover the insects and keep them safe. Soon the spittlebugs will grow up and leave their foam home. They will join the other insects in the grassland. Question: According to the passage, the white foam _ . - does much harm to the plant - protects the plant from being harmed - is where a mother spittlebug is living - is plant juice mixed with spittlebugs' waste and the air
is plant juice mixed with spittlebugs' waste and the air

Read the following article and select the best answer. Article: Audrey Hepburn (.)won an Academy Award as Best Actress for her first major American movie, Roman Holiday, which was released in 1953. But she is remembered as much for her aid work as for her acting. Born in Belgium in 1929, Audrey's father was British and her mother was Dutch. Audrey was sent to live at a British school for part of her childhood. During World War II, she lived and studied in the Netherlands. Her mother thought it would be safe from German attacks. Audrey studied dance as a teenager and when she returned to London after the war. But she realized she wasn't going to be a ballerina .So she began taking acting parts in stage shows. Later she began to get small parts in movies. But it was Audrey Hepburn's move to America that brought her true fame. In 1951 she played the character "Gigi" in the Broadway play of the same name to great critical praise. Two years later, Roman Holiday made her a star at the age of 24. Audrey made more than 25 movies. Among her most popular roles was Holly Golightly in Breakfast at Tiffany's in 1961. Three years later, she played Eliza Doolittle in My Fair Lady. She was married twice. In 1989, the UN Children's Fund named Audrey a goodwill ambassador. She travelled all over the world in support of UNICEF projects. She often gave 15 interviews a day to gain money and support for UNICEF projects. Audrey Hepburn often said her loyalty to UNICEF was the result of her experiences as a child during World War U. She said she knew what it was like to be starving and to be saved by international aid. She was a goodwill ambassador until her death in 1993 from colon cancer. Question: The reason why Audrey lived and studied in the Netherlands was that _ . - the education there was excellent - her parents were from Britain - it was safe there - she wanted to be a ballerina
it was safe there

Read the following article and select the best answer. Article: A previously unknown kind of human group disappeared from the world so completely that it has left behind the merest piece of evidence that it ever existed -- a single bone from the little finger of a child, buried in a cave in the Altai Mountains of southern Siberia. Researchers removed DNA from the bone and reported that it differed obviously from that of both modern humans and of Neanderthals , living in Europe until the arrival of modern humans on the continent some 44,000 years ago. The child carrying the DNA line was probably 5 to 7 years old, but it is not yet known if it was a boy or a girl. The finger bone was unearthed in 2008 from a place known as the Denisova cave. Researchers are careful not to call the Denisova child a new human species, though it may prove to be so, because the evidence is initial. But the genetic material removed from the bone, found in a layer laid down on the cave floor between 48,000 and 30,000 years ago, belonged to a distinct human line that traveled out of Africa at a different time from the two known ancient human species. Homo erectus , found in East Asia, left Africa two million years ago, and the ancestor of Neanderthals moved away some 500,000 years ago. The numbers of differences found in the child's DNA indicate that its ancestors left Africa about one million years ago. The region was inhabited by both Neanderthals and modern humans at that time. Counting the new human line, three human species may have lived together. The standard view has long been that there were three human resettlements out of Africa -- those of Homo erectus; of the ancestor of Neanderthals; and finally, some 50,000 years ago, of modern humans. But in 2004, archaeologists reported that they had found the bones of small humans who lived on the Indonesian island of Flores until 13,000 years ago, causing a serious problem to this view. The new line is the second such challenge. If the nuclear DNA of the Denisova child should differ as much as its mitochondrial DNA... Question: Evidence from the bone of the child shows that _ . - its ancestor moved to Europe 1,000,000 years ago - the habitat of its ancestor was in Africa - the Denisova child belonged to Neanderthals - the Denisova child is a new human species
the habitat of its ancestor was in Africa