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【单选题】
某多头套期保值者，用7月大豆期货保值，入市成交价为2000元／吨；一个月后，该保值者完成现货交易，价格为2060元／吨，同时将期货合约以2100元／吨平仓。如果该多头套保值者正好实现了完全保护，则该保值者现货交易的实际价格是（）。A.
2040元／吨
B.
2060元／吨
C.
1940元／吨
D.
1960元／吨
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【单选题】What should we pay attention to when maceration, dissolution, extraction, partition and concentration were used for sample preparation?
A.
Maceration, dissolution and extraction: homogenise the sample as soon as possible to facilitate a uniform and efficient extraction of ytes from the sample matrix prior to partition, beside that a degree of matrix integrity (heterogeneity) needs to be maintained;
B.
C oncentration: The definition and inclusion for essential element are not the same in plant and animal systems. Because the trace elements essential for plants are those elements which cannot be substituted by others in their specific biochemical roles and that have a direct influence on the organism so that it can neither grow nor complete some metabolic cycle.
C.
P artition: transfer of an yte or ytes from the extractant to the partitioning solvent with high efficiency;
D.
C oncentration: do not reduce the volume of solvent by the application of too much heat, which may lead to some alteration or decomposition of the yte. It is better to use a lower temperature, at reduced pressure if possible, to expedite rapid solvent removal. Once the solution has been reduced to a small volume, ca. 5 cm 3 , a more prudent method is to direct a stream of dry nitrogen gas onto the suce of the extract.
【简答题】局麻药的化学结构可概括为三部分,即{1}、{2}和亲水部分。
【单选题】听力原文： Up to about 1915, movies were short and programs were made up of several works. Then, D. U. Griffith and others began to make longer films which provided the same powerful emotional appeal as di...
A.
Films provided more melodrama.
B.
Films provided longer programs.
C.
Films provided emotional appeal.
D.
Films provided greater spectacles.
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