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With its radiant color and plantlike shape, the sea anemone looks more like a flower than an animal. More specifically, the sea anemone is formed quite like the flower for which it is named, with a body like a stem and tentacles like petals in brilliant shades of blue, green, pink, and red Its diameter varies from about six millimeters in some species to more than ninety centimeters in the giant varieties of Australia. Like corals, hydras, and jellyfish, sea anemones are coelenterates. They can move slowly, but more often they attach the lower part of their cylindrical bodies to rocks, shells, or wharf pilings. The upper end of the sea anemone has a mouth surrounded by tentacles that the animal uses to capture its food. Stinging cells in the tentacles throw out tiny poison threads that paralyze other small sea animals. The tentacles then drag this prey into the sea anemone's mouth. The food is digested in the large inner body cavity. When disturbed a sea anemone retracts its tentacles and shortens its body so that it resembles a lump on a rock. Anemones may reproduce by forming eggs, dividing in half or developing buds that grow and break off as independent animals.
1.The word "shape" in line 1 is closest in meaning to which of the following?
A.Length.
B.Grace
C.Form
D.Nature
2.According to the passage, which of the following statements is NOT true of sea anemones?
A.They are usually tiny.
B.They have flexible bodies.
C.They are related to jellyfish
D.They are usually brightly colored.
3.It can be inferred from the passage that sea anemones are usually found
A.attached to stationary surfaces
B.hidden inside cylindrical objects
C.floating among underwater flowers
D.chasing prey around wharf pilings
4.The word "capture" in line 8 is closest in meaning to which of the following ?
A.Catch
B.Control
C.Cover
D.Clean
5.The word "disturbed" in line 11 is closest in meaning to which of the following?
A.Bothered
B.Hungry
C.Tired
D.Sicki
6.The sea anemone reproduces by
A.budding only
B.forming eggs only
C.budding or dividing only
D.budding, forming eggs, or dividing
海葵因其鲜艳的颜色和植物般的形状看起来更像一朵花而不是一种动物。更具体地说，海葵的形状与它名字来源的花非常相似，身体像茎，触手像花瓣，呈现出亮丽的蓝色、绿色、粉色和红色等色调。它的直径因种类而异，小的种类约为六毫米，而澳大利亚的巨型海葵直径超过九十厘米。与珊瑚、水螅和水母一样，海葵属于腔肠动物。它们可以缓慢移动，但更多时候它们会将柱状身体的下端附着在岩石、贝壳或码头桩上。海葵的上端有一个被触手包围的口部，触手用于捕捉食物。触手上的刺细胞能够释放出微小的毒丝，麻痹其他小型海洋动物。然后触手会将猎物拖入海葵的口中。食物在海葵内部的大腔体中被消化。当受到干扰时，海葵会缩回触手并缩短身体，看起来像一块岩石上的凸起。海葵可以通过产生卵细胞、分裂成两部分，或发育出芽体来繁殖，这些芽体会生长并脱落，成为独立的个体。
