2013年托福考试阅读模拟试题及答案6_第3页

　　PARAGRAPH 7

　　Some animals have behavioral, physiological, and morphological (structural) adaptations that enable them to withstand extreme conditions. For example, the ostrich has 1 plumage that is so constructed that the feathers are long but not \ too dense. When conditions are hot, the ostrich erects them on its 1 back, thus increasing the thickness of the barrier between solar radiation and the skin. The sparse distribution of the feathers, however, also allows considerable lateral air movement over the skin surface, thereby permitting further heat loss by convection.Furthermore, the birds orient themselves carefully with regard to the Sun an0 gently flap their wings to increase convection cooling.

　　11、According to paragraph 7, what special adaptation helps the ostrich cope with hot desert conditions?

　　Each of its feathers is very short and dense.

　　Its wings produce only lateral air movement when flapping.

　　Its feathers are very thickly set on both its back and its wings.

　　It can make its feathers stand up on its If back.

　　12、Look at the four squares that indicate where the following sentence could be added to the passage.

　　The increase in reward still did not attract young people to this hard life, and convicted criminals and slaves were pressed into services

　　Where would the sentence best fit?

　　PARAGRAPH 1

　　The harsh conditions in deserts are intolerable for most plants and animals. Despite these conditions, however, many varieties of plants and animals have adapted to deserts in a number of ways. Most plant tissues die if their water content falls too low: the nutrients that feed plants are transmitted by water; water is a raw material in the vital process of photosynthesis; and water regulates the temperature of a plant by its ability to absorb heat and because water vapor lost to the atmosphere through the leaves helps to lower plant temperatures. ■ Water controls the volume of plant matter produced. ■ The distribution of plants within different areas of desert is also controlled by water. ■ Some areas, because of their soil texture, topographical position, or distance from rivers or groundwater, have virtually no water available to plants, whereas others do. ■

　　13. Directions: From the seven statements below, select the statements that correctly characterize breathing during wakefulness and those statements that correctly characterize breathing during sleep. Drag each answer choice you select into the appropriate box of the table. Two of the answer choices will NOT be used. This question is worth 3 points.

　　Adaptations of Annuals BF

　　Five of the phrases will NOT be used.

　　A. Woody structures

　　B. Explosive growth in wet years

　　C. Long, thin, shallow roots

　　D. Storage of water in plant tissue

　　E. Minimization of the amount of water used for

　　Adaptations of Perennials ADG

　　Four of the phrases will NOT be used,

　　A. Woody structures

　　B. Explosive growth in wet years

　　C. Long, thin, shallow roots

　　D. Storage of water in plant tissue

　　E. Minimization of the amount of water used for photosynthesis

　　F. Short life cycle

　　G. Leaves designed to minimize water loss