The author is primarily concerned with ______.
A. refuting a claim about the influence of Puritan culture on the early American South
B. refuting a thesis about the distinctiveness of the culture of the early American South
C. refuting the two premises that underlie Davis' discussion of the culture of the American
D. challenging the hypothesis that early American culture was homogeneous in nature
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The present selection has apparently been preceded by some explanation of ______.
A. some experiments with color pigments
B. the nature of color
C. the color properties of various surfaces
D. the mechanism of the eye's adaptation to color
The author suggests that the work of Fisher and Hamilton was similar in that both scientists ______.
A. conducted their research at approximately the same time
B. sought to manipulate the sex ratios of some of the animals they studied
C. sought an explanation of why certain sex. ratios exist and remain stable
D. studied reproduction in the same animal species
在班轮运价表内标示“W/M”表示（ ）。
A. 按货物重量计价
B. 按货物体积计价
C. 按货物质量计价
D. 按货物重量或体积收费较高者计算单位运价
我们通常所说的关税壁垒是指（ ）。
A. 低额出口税
B. 高额出口税
C. 低额进出口税
D. 高额进出口税
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