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Read the article and select the best answer. Article: Have you ever wondered how and why a fall leaf changes color? We first have to understand what leaves are and what they do. Plants are the world's food factories. Plants take water from the ground and take CO2from the air. Plants use sunlight to turn water and CO2into glucose . Glucose is a kind of sugar. Using it as food, plants get energy and grow. Plants using sunlight to turn water and CO2into sugar is called photosynthesis . _ helps photosynthesis. It gives plants their green color. As summer ends and autumn comes, the days get shorter and shorter, and trees "know" to begin getting ready for winter. During winter, there is not enough light or water for photosynthesis. Trees rest during this time and live on the food they store during the summer. They begin to shut down their food -- making factories. As the green chlorophyII disappears from the leaves, we begin to see yellow and orange leaves. These colors have been in the leaves all the time. We just can't see them in the summer, because they are covered up by the green chlorophyII. The bright reds and purples we see in leaves are made mostly in autumn. In some trees, glucose is caught in the leaves after photosynthesis stops. Sunlight and the cool nights of autumn turn this glucose into a red color. The brown color of trees is made from waste left in the leaves. It is mixture of all these things. It makes the beautiful leaves during autumn. . Question: What's the main meaning of this passage? Options: A: What's photosynthesis? B: How and why leaves change colors? C: Different kinds of leaves. D: How the seasons change.
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B

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Read the article and select the best answer. Article: Have you ever watched the big parade on Tian'anmen Square on October 1? Some students performed in the big parade. In order to get ready for it, this summer, many Beijing middle school students had a different kind of vacation. Instead of hanging out with friends or traveling, they trained hard for the 60th birthday of China this year. Students trained from 7:30 am to around 10:00 am or from 4 pm to 6:30 pm, because it was very hot this summer. They wore white hats, T-shirts and blue trousers. The hats and T-shirts were printed with a red logo, the number "60". The first week of training was PE. Students practiced standing and squatting. Then they moved on to practice the group show. When we watched the parade on TV we saw them making colorful pictures. What did the students think of their unusual summer? "Sometimes we find it a bit tiring." said Lu Wenqi, 13. "But most of us think it's a great _ to take part in such an important show." Li Hui, 15, thought the same as Lu. She said her classmates were hardly late for training. "It's a wonderful chance for us," said Li. "When my parents were in college, they also took part in a national day parade. Now it's my turn!" Question: The students performed a group show for the 60th birthday of China on _ . Options: A: September 1st B: October 1st C: October 60th D: November 1st
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B

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Read the article and select the best answer. Article: Without flowers, many plants would not be able to reproduce and many insects would not be able to get enough food to live. Here are some interesting facts about flowers plants. * Most plants grow flowers each year, but some take much longer. The century plant grows only one flower and then it dies! Even more amazing is a plant from South America called Puya raimondii. It doesn't grow a flower until it is 150 years old, and after that it dies, too. * The smallest flowering plant in the world is thought to be the common watermeal . Its leaves are only 1mm across! * Bamboo has amazing flowering habits. There are many different kinds of bamboo in the world. And they have different flowering habits. A few flower each year, but most wait much longer. What is amazing is that all bamboo of the same kind will flower almost at the same time, where it is 6 growing! Nobody knows why. * The white flower of the Amazon water lily is the size of a football, and the flower turns purple after it has been pollinated . * The Caucasian lime can grow in Britain. Its flowers are _ to bees. If they touch the flowers, they will die. Question: Which of the following is TRUE according to the passage? Options: A: Many insects get their food from flowers. B: After growing a flower, the century plant will grow better. C: The common watermeal has the smallest leaves in the world. D: Bees will die if they touch the leaves of the Caucasian lime.
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A