语法与词汇The gray scale, a progressive series of shades ranging from black to white, is used in computer graphics _____ detail to graphical images.
语法与词汇Forests stabilize _____and retain precipitation, thereby helping to prevent erosion and regulate the flow of streams.
语法与词汇Although rain falls throughout most of the world, in Antarctica, and in a few other places, -------precipitation occurs as ice and snow.
语法与词汇(Any) state, by (its) own constitutional or legislative action, may eliminate, consolidate, or otherwise (modification) countries and (their) government.
语法与词汇he Sun, the Moon, and Earth have magnetic fields, and_________ evidence that the stellar that extend through vast regions galaxies have fields of space.
语法与词汇Ostrich eggs are larger ----of any Other living animal; they may be 150 mm long and 127 mm wide and have a shell 1.97 mm thick.
语法与词汇Not only-----the centre of French language and culture in North America, it is the…
语法与词汇The migration of African Americans from the rural South to the (industrial) North in (the early) 1900''s (were) the (biggest internal) migration in American history.
语法与词汇The North American Review, a (magazine was) first (published) in 1815, was one of the (leading) literary (journals) of the past woe centuries.
语法与词汇The pulse (that may) be felt (wherever) an artery (passes over) a solid structure, such as (a bone )or cartilage.
语法与词汇Cells,first identified by the early microscopists, began to be considered________in the nineteenth century.
语法与词汇The average wavelength of visible light is2,000 times __________ the diameter of an atom.
语法与词汇Ohio, the center of _________ the Hopewell culture, has the greatest concentration of ancient burial mounds in the United States.
语法与词汇Photography disseminates information (about humanity) and nature, records the (visible) world, and (extension) human knowledge into (areas the) eye cannot penetrate.
语法与词汇Wild birds and their eggs have been (at least) incidental sources of food for humans (since) prehistoric times and they (still) are in (most of) societies.
语法与词汇On attaining maximum size, ___ by drawing itself out and dividing into two daughter amoebas, each receiving identical nuclear materials.