题干：55. What do we learn about sea slugs from the passage?
其余四个题干：
51. What is the distinctive feature of a sea slug?
52. What enables the sea slug to live like a plant?
53. What does the author say about baby sea slugs?
54. What does Sidney Pierce say about genes from an alga?
显然，本题只有背景词sea slug，但是注意，四级通常不会考察涉及全文的细节题，所以本题就在文章切分后的最后一部分，重点关注明确背景词sea slug所在的句子，虽然代词they确实指代sea slug，但是不是明确背景词，不考虑。根据此前对于文章的切分，答案在文章最后一段：
The sea slugs are so good at gathering energy from the sun that they can live up to nine months without having to eat any food. They get all their nutritional needs met by the genes that they’ve hijacked from the algae.
逐一对照选项：
A.They behave the way most plant species do.
本部分没有表示程度的most，当然，也没有behave，也没有plant species，排除。
B.They can survive for months without eating.
survive=live；for months= up to nine months；without eating= without having to eat any food，完美同义替换，正确选项。
C.They will turn into plants when they mature.
mature，turn into plants均没有，排除。
D.They will starve to death without sunlight.
starve to death在前一题所在定位区域，另外原文也没有without sunlight，排除。
选择B
再来从精读的层面看看这部分：
55.What do we learn about sea slugs from the passage?
翻译：从这篇文章中，我们对海蛞蝓有什么了解？
文段：
The sea slugs are so good at gathering energy from the sun that they can live up to nine months without having to eat any food. They get all their nutritional needs met by the genes that they’ve hijacked from the algae.
be good at doing sth./sth.，擅长……
nutritional /njuˈtrɪʃən(ə)l/，营养的
翻译：这些海蛞蝓极其擅长从阳光中汲取能量，甚至可以在不进食的情况下存活长达九个月。它们通过从藻类那里“劫持”来的基因，满足自身的全部营养需求。
选项：
A.They behave the way most plant species do.
翻译：它们的行为方式与大多数植物物种相同。
B.They can survive for months without eating.
survive，幸存
翻译：它们可以在不进食的情况下存活数月。
C.They will turn into plants when they mature.
mature，成熟
翻译：它们成熟后会变成植物。
D.They will starve to death without sunlight.
starve，挨饿
翻译：没有阳光它们就会饿死。
简单小结一下这题的词汇
核心词汇：
survive
mature
starve
其他词汇：
be good at doing sth./sth.
nutritional
好了，今天就说到这里吧。
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