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.
语法与词汇For the advertiser, one of the greatest appeals of radio is ____ an audience all day long.
语法与词汇I waited there for thirty minutes;that seemed ________ hours to me.
语法与词汇Willa Cather, __________, gained recognition for her books concerning the American frontier.
语法与词汇Most documentary filmmakers use neither actors _______studio setting.
语法与词汇The importance of the hand, and more generally of the body, in children’s acquisition of arithmetic_____.
语法与词汇A challenging new area in inorganic chemistry is ---- the role of transition metals in the biochemical catalysts called enzymes.
语法与词汇Protective behaviors of (amphibians) include hiding (in) the presence of danger and (having) coloration (such) closely matching the environment that the animal is not obvious.
语法与词汇The first inhabitants of the territories ____Canada came across the Bering Strait and along the edge of the Arctic ice.