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[Reading Comprehension]
试题详情
文章：
| Line | Determining whether a given population of animals |
| constitutes a distinct species can be difficult | |
| because no single accepted definition of the term | |
| exists. One approach, called the biological species | |
| (5) | concept, bases the definition on reproductive |
| compatibility. According to this view, a species | |
| is a group of animals that can mate with one | |
| another to produce fertile offspring but cannot | |
| mate successfully with members of a different | |
| (10) | group. Yet this idea can be too restrictive. First, |
| mating between groups labeled as different species | |
| (hybridization), as often occurs in the canine family, | |
| is quite common in nature. Second, sometimes | |
| the differences between two populations might not | |
| (15) | prevent them from interbreeding, even though they |
| are dissimilar in traits unrelated to reproduction; | |
| some biologists question whether such disparate | |
| groups should be considered a single species. A | |
| third problem with the biological species concept is | |
| (20) | that investigators cannot always determine whether |
| two groups that live in different places are capable | |
| of interbreeding. | |
| When the biological species concept is difficult | |
| to apply, some investigators use phenotype, an | |
| (25) | organism’s observable characteristics, instead. |
| Two groups that have evolved separately are likely | |
| to display measurable differences in many of their | |
| traits, such as skull size or width of teeth. If the | |
| distribution of measurements from one group does | |
| (30) | not overlap with those of another, the two groups |
| might reasonably be considered distinct species. |
题目：
Which of the following best describes the function of lines 10–13
选项:
A、It elaborates the definition of the biological species concept given in a previous sentence.
B、It develops a point about the biological species concept made in the previous sentence.
C、It states the author’s central point about the biological species concept.
D、It identifies a central assumption underlying the biological species concept.
E、It demonstrates why the biological species concept is invalid.
答案:
B
提问：
老师，这道题我选了E，从原文来看，其实作者这句话就想说这个理论有限制，说他不好嘛，E直接对应了，而其实看B答案也能理解，看不出什么错，但是问题是建立point就那一句，而原文提到了first那句，怎么理解呢？
解答：
点赞1
阅读861
提问：
老师，这道题我选了E，从原文来看，其实作者这句话就想说这个理论有限制，说他不好嘛，E直接对应了，而其实看B答案也能理解，看不出什么错，但是问题是建立point就那一句，而原文提到了first那句，怎么理解呢？
解答：
点赞1
阅读862
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