12．A．fertilization B．restored C．surface D．contained AB．growth AC．bears
AD．extinct BC．waste BD．float CD．determines ABC．Consists
Most plants reproduce by forming seeds．Flowering plants usually produce seeds that are（51）D in fruits．The scientific name for such a plan is angiosperm （被子植物）．The fruit covering makes seeds more likely to be scattered over a wide area by animals，wind，or water．A plant that grows in many area is less likely to become （52）AD than one that grows in only one area．The fruit of an angiosperm is not necessarily something that people can eat．In this case，the word fruit simply refers to the mass of plant tissue that surrounds the send．Some angiosperm fruits are actually poisonous．
Angiosperms depend on male and female flower parts to produce their seeds and fruits．At the center of the flower is the pistil，a female part that （53）ABC of a long column with a round base called an ovary （子房）．Inside the ovary are the tiny ovules （胚珠） that become seeds if they are fertilized．（54）Aoccurs when pollen from a stamen，a male flower parts，joins the ovule inside the ovary．Pollen that reaches the tip of the pistil grows a long tube down into the ovary．Once pollen joins the ovule inside the ovary，a seed begins to form，the ovary becomes fruits，and the other flower parts wither and die．
The form of a fruit （55）AD the manner in which seeds are scattered．For example，birds and other animals may eat soft，fleshy fruits，such as berries．These animals deposit the seeds in their （56）BC，usually far from the parent plants．Some hard-shelled fruits that （57）BD-such as coconuts-are carried by water to faraway regions．Some other types of fruits rely on the wind to scatter their seeds．The milkweed （58）AC fruit in the form of dry seedpods that grow until they burst．Once the seedpods burst，hundreds of seeds，each attached to many light，silken threads，are carried off by the wind．
No matter how much angiosperm fruits and seeds may differ，each seed contains the same blueprint for（59）AB．Under the right conditions，the tiny embryo within the seed grows into a new plant．The embryo is made up of a root，a shoot，and one or two seed-leaves called cotyledons （子叶），which provide food for the sprouting plant．As the seed spouts，the root anchors the seeding in the earth，and the shoot grows up through the soil．As soon as the seeding penetrates the soil's （60）C，it begins to grow its first true leaves．
分析 本文是一篇记叙文，讲述了植物的繁殖方式．具体以鲜花类的植物和蔬果类的植物为例，介绍了它们繁殖过程中的区别以及共同点．
解答 51-60．D AD ABC A AD BC BD AC AB C
51．D．contained 包含，前面提到"Most plants reproduce by forming seeds"，即大多数植物通过形成种子来繁殖，而植物类的包含花草和水果．故选D．
52．AD．extinct 灭绝的，根据句意，相比于只生长在一个区域内，生长在多个区域内更有利于减少灭绝的可能性．故选AD．
53．ABC．Consists 由…构成，根据后面的"a long column with a round base called an ovary （子房）"可知，这是雌蕊的组成部分．故选ABC．
54．A．fertilization 授粉，根据后面的描述"when pollen from a stamen，a male flower parts，joins the ovule inside the ovary"可知，这是花朵在授粉．故选A．
55．AD．extinct 灭绝的，根据后面的解释"birds and other animals may eat soft，fleshy fruits，such as berries"可知，与植物不同，水果的种子如果是分散的，那么这种水果就容易灭绝，因为水果会被鸟类和其它动物吃掉．故选AD．
56．BC．waste 多余的，根据常理，动物会将多余的食物储存起来．故选BC．
57．BD．float 浮动，根据后面举的例子"coconuts-are carried by water to faraway regions"，椰子被水带到了遥远的地方，可知有的水果有坚硬的外壳，能漂浮起来．故选BD．
58．AC．bears 结出，根据句意，乳草结出的种子是以干籽的形式生长，直到它们爆裂．故选AC．
59．AB．growth 生长，根据后面的例子可知，不管被子植物的果实和种子有多大的区别，它们的生长计划都是相同的．故选AB．
60．C．surface 表面，根据常理，只要种子钻进土地表面，就能生根发芽．故选C．
点评 做此题时应先通读全文，了解短文大意，再仔细阅读，联系上下文选出合适选项，有的时候要注意词形变换．做完后仔细检查，以避免错误．
