★★★

看題：

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

文章講解：

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 事實呈現(xiàn)

? ? ?↓

③ + ④ 提出問題（朝向不能簡單用石頭大小解釋，也不能用流速等其他原因解釋）

? ? ?↓

? ? ⑤ 給出一種解釋 ? ⑥ 仍不清楚? ??

題型解析：

結合錯誤標簽，單選選最優(yōu)。

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 沒有證據(jù)/相反

B. Establishing nest orientation as a determining factor in egg laying among female river blennies 廣義同義替換。排他因的加強型文章

C. Questioning the importance of nest size as an influence on egg laying among female river blennies?細節(jié)以偏概全

D. Comparing the features?of female river blennies that face southeast with those of nests facing in other directions?沒有證據(jù)

E. Examining how female river blennies determine the?relative importance?of nest size versus nest orientation 沒有證據(jù)

?

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 無關/沒有證據(jù)

B. indicate one possible advantage of river blenny nests that do not face southeast 沒有證據(jù)

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 沒有證據(jù)

E. suggest a reason why many female blennies prefer southeast-facing nests 同上，沒有證據(jù)

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.