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解释及问题：
5

A 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.

所以，入口西南朝向本身，似乎是雌鱼择巢的特征，而不是因为巢口水流速度而选择巢口的朝向。

6

The reasons for this preference are unclear, however.

然而，这种偏好的原因仍未探明。

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

B. Establishing nest orientation as a determining factor in egg laying among female river blennies

C. Questioning the importance of nest size as an influence on egg laying among female river blennies

D. Comparing the features of female river blennies that face southeast with those of nests facing in other directions

E. Examining how female river blennies determine the relative importance of nest size versus nest orientation

选 B

确定巢的朝向是河生雌性鳚鱼产卵的决定因素。

establish 此处解释为 确定、证实。

A 错。句 5 ，水流速度没啥区别 similar 。

C 错。文章没有质疑大石偏好，只在句 2 提了一下：Blennies deposit their eggs preferably in nests under large stones and in nests facing southeast.

D 错在 features of female river blennies，没有讨论鱼，只讨论了巢，水流什么的。

E 错。没有比较两种因素哪个更重要。

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

B. indicate one possible advantage of river blenny nests that do not face southeast

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

E. suggest a reason why many female blennies prefer southeast-facing nests

选 C

去掉一种可能的解释。

鱼产卵有两种偏好，大石头，开口朝东南。文段着重讨论了开口朝向的问题，但也只能通过实验推出，鱼这么选跟水流速度无关，至于真正的原因，目前还不知道。

综上，选 C 。

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