passage 138 选巢偏爱东南朝向的鲇鱼
★★★
看题：
1. The passage is concerned with which of the following 主旨，看框架
2. The author of the passage considers “current speeds” in order to 信息目的，看局部
文章讲解：
①When selecting a nest, the female of the river blenny (a small fish) appears to be sensitive to both size and orientation. ②Blennies deposit their eggs preferably in nests under large stones and in nests facing southeast. ③Southeast-facing nests contain larger egg clutches, a fact that cannot be completely explained by differences in nest stone sizes. ④Moreover, in a recent study, current speeds upstream of the nest and at the nest entrance were similar for nests facing southeast and those facing in other directions. ⑤A southeast-facing entrance per se thus seems to be the specific nest feature preferred by females, rather than the effect of selective positioning on current at nest entrance. ⑥The reasons for this preference are unclear, however.
① + ② 事实呈现
↓
③ + ④ 提出问题（朝向不能简单用石头大小解释，也不能用流速等其他原因解释）
↓
⑤ 给出一种解释 ↔ ⑥ 仍不清楚
题型解析：
结合错误标签，单选选最优。
1. The passage is concerned with which of the following
A. Determining the different ways in which current speeds can influence the nesting preferences of female river blennies 没有证据/相反
B. Establishing nest orientation as a determining factor in egg laying among female river blennies 广义同义替换。排他因的加强型文章
C. Questioning the importance of nest size as an influence on egg laying among female river blennies 细节以偏概全
D. Comparing the features of female river blennies that face southeast with those of nests facing in other directions 没有证据
E. Examining how female river blennies determine the relative importance of nest size versus nest orientation 没有证据
2. The author of the passage considers “current speeds” in order to
A. identify a factor that undermines the significance of nest stone size for female river blennies 无关/没有证据
B. indicate one possible advantage of river blenny nests that do not face southeast 没有证据
C. eliminate a possible explanation for a nest orientation tendency among female river blennies
D. indicate why female river blennies are sensitive to both size and orientation of possible nests 没有证据
E. suggest a reason why many female blennies prefer southeast-facing nests 同上，没有证据
背景拓展：
Blenny is a common name for a type of fish. The term is ambiguous, having been applied to several families of percomorph marine, brackish, and some freshwater fish sharing similar morphology and behaviour.
Also known as the Panama Blenny (Ophioblennius steindachneri), this small fish was perched on a rock at Machete dive site in the Coiba National Park, Panama.
