Welcome to our introductory course on nutrition. This first lecture will center on a very valuable member of the beam family. The soy bean (大豆)is a highly nutritious bean which also can serve as a meat substitute. Some people call soy beans incredible. Let me give you some examples of why the soy bean is so special. First of all, when it is made into meal, it enhances animal feed. Secondly, as soy four it similarly enriches the baked goods we humans eat. Thirdly, as soy chips or flakes, it’s often included in cereals. And lastly, In some countries, for example, China. The soy beam is processed into virtually all fresh milk consumed there. It is also the basic ingredient of textured vegetable protein which brings a meat-like taste and feel to vegetarian dishes. For many years soy bean were thought of in the United States only as a commercial agricultural crop. Now, however, the soy bean is being, raised in backyard gardens, It’s easy to grow and, as I have poin
A. a food producer
B. an English language teacher
C. a nutrition professor
D. an American Chinese
Birds are warm-blooded, vertebrate animals whose bodies are covered with feathers. Other characteristics of birds are: wings; a short tail bone; the visible tail being composed entirely of feathers; a weak or nonexistent sense of smell; no teeth; and keen hearing, despite the absence of external ears. As in mammals (哺乳动物), the only other group of warm-blooded animals, the blood in the veins (静脉) of birds is kept totally separated from the blood in the arteries (动脉).
Birds evolved from reptiles, especially from some small dinosaur-relative. Gradually the scales of the dinosaur evolved into feathers, perhaps first for insulation as the animal evolved from cord to wing blade but later for flight. It is still unknown, however, whether flight developed when a ground-living form began to flap its wings to increase its running speed (like the ostrich today), or when a tree climbing form used imperfect wings to aid it in leaping from tree limb to tree limb. The evolution
A. Birds evolved from reptiles.
B. It is known to all that flight developed when a ground-living form began to flap its wings to increase its running speed.
C. It is known to all that flight developed when a tree-climbing form used imperfect wings to aid it in leaping from tree limb to tree limb.
D. The evolution from reptile to the bird concluded about 75 thousand years ago.
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