MAP测试真题阅读G6年级.pdfVIP

学而美美国 K12 教育 MAPtestReadingGrade 6 LightingUptheNight 1 On a warm summer evening in the American Midwest, it’s not unusual to see hundreds of tiny lights flickering over a grassy field. These lights are not from mini flashlights or from tiny fairy lanterns. Rather, they are from small insects called fireflies,which are alsoknown aslightningbugs.They havetheunique ability tolight up their bodies in a soft yellow glow. This ability is called bioluminescence. The prefix “bio” means “life” and “luminescence” means “the emission of light.” So, “bioluminescence”means“life formsthat can maketheir own light.” LightingUptheLand 2 Fireflies are not the only land animals that have this capability. The glittering glowwormsofNew Zealand can also light up thenight.They areusually found on the walls of dark, damp caves and glow a soft aqua blue.A snail that lives in Southeast Asia can set itsbody aglow,too,but only when it isyoung.Once it becomes an adult, it can no longer produce its own light. Many types of worms, cockroaches, beetles, and millipedes around the world also can glow. Plants also get into the night light action. Scientists have discovered at least 50 different types of mushrooms in places acrossAustraliaandNorthAmericathat can glow inthedark. LightingUpthe Sea 3 Even though many land animals can create their own light, the largest number of bioluminescent life formsisfound in Earth’soceans.There are somany,in fact,that it is estimated that more than 78 percent of the organisms in the ocean can make their own light. 4 Most people assume thebioluminescent animals in the ocean only live down deep on the ocean floor,but that isnot the case.Bioluminescent ocean animalscan be found at many different depths of the ocean, from the ocean’s surface all the way down to the seafloor. 5 Glowing sea life ranges from the tiny to the