语法与词汇In 1846 --- agreed upon the boundaries separating what would become Washington and British Columbia.
语法与词汇Eva G. direct-------in Huntington, New York, from 1962 to 1978.
语法与词汇Although all sedimentary rocks contain iron, (but the deposits) that (are richest) in iron (consist) predominantly of minerals (such as) iron oxides, carbonates, silicates, and sulfides.
语法与词汇___________ over 100 years since the invention of the square-bottomed paper bag.
语法与词汇A uniform mingling of molecules, (which it) occurs in homogeneous chemical compounds, results from the (chemical) constituents melting, dissolving, (or) diffusing into (one another).
语法与词汇Bill said that he didn't do _______ paper work.
语法与词汇About 25000 years ago some of North America’s early settles walked across the land-------between Siberia and Alaska.
语法与词汇"As for their going along with us,"she said,"________ ".
语法与词汇___ nerve pathways connect the eye directly to the pineal gland, that gland is extremely sensitive to light.
语法与词汇A mobile is a sculpture constructed of pans so delicately connected and balanced______the entire suspended structure may be moved by vibration or manual manipulation.
语法与词汇The trumpet is-----of most dance and jazz bands.
语法与词汇The Arctic fox is found throughout the Arctic, usually on tundra or mountains ______ the sea.
语法与词汇To break thick ice, an icebreaker boat moves fast enough to ride up on the ice, ____ under its weight.
语法与词汇The DP began to assume its modern form during the intense political conflict __ US citizens after the war of 1892.
语法与词汇Canada began (cultivation) wheat intensively in 1910, which (led to) a demand for tools, machines, (housing), and (building supplies).
语法与词汇A major source of rock salt is domes, ------of rock salt embedded in surrounding layers of earth.
语法与词汇Lumber (production) was the (main industry) in Michigan until (the early) 1900''s, (which) the automobile industry was established in Detroit.
语法与词汇Uncertainty differs from risk in that-------basis for estimating the probability of each potential condition occurring.