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【单选题】
How did scientists discover the source of lead pollution in Greenland（ ）?A.
By analyzing the data published in journals like Nature and Ambio.
B.
By observing the lead accumulations in different parts of the arctic area.
C.
By studying the chemical elements of soil and snow in Northeastern America.
D.
By comparing the chemical compositions of leaded gasoline used in various countries.
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举一反三
【单选题】If the market demand curve shifts sharply to the left as the market supply curve moves to the right, we would expect:
A.
the same price to prevail, with no change in quantity.
B.
the same quantity to prevail.
C.
price and quantity to fall.
D.
price to fall while quantity may or may not change.
【多选题】下列哪些性质与安乃近的性质相符合
A.
本品易溶于水
B.
水溶液稳定,遇酸、碱、氧化剂、日光都不分解
C.
本品呈钠盐的焰色反应
D.
易溶于盐酸、加次氯酸钠试液,产生瞬即消失的蓝色
E.
本品制剂为片剂及注射液
【单选题】舌尖前音z、c、s的正确发音方式是()。
A.
舌尖伸平，顶住或接近上齿背
B.
舌头略向后缩，舌尖上翘，抵住或接近硬腭前端
C.
舌尖伸平，夹在两齿间
D.
舌尖前伸，顶住或接近下齿背
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