一道典型的“程度改变”的题目，一起来看看什么是“程度改变”：
题干：53. What does the author say about baby sea slugs?
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?
54. What does Sidney Pierce say about genes from an alga?
55. What do we learn about sea slugs from the passage?
对比五个题干，这题的定位词显而易见，就是独一无二的baby；下一题的定位词显然是Sidney Pierce，文章的切分也不复杂
……// (53) Their babies retain the ability to produce their own chlorophyll, though they can’t generate energy from sunlight until they’ve eaten enough algae to steal the necessary genes, which they can’t yet produce on their own.
// (54) “There’s no way on earth that genes from an alga should work inside an animal cell,” says Sidney Pierce from the University of South Florida. “And yet here, they do. They allow the animal to rely on sunshine for its nutrition. So if something happens to their food source, they have a way of not starving to death until they find more algae to eat.”
对照选项
A)They can live without sunlight for a long time.
sunlight原文有，但是前面是can’t generate energy from，跟选项的live without不一致；最重要的是，后面的for a long time原文根本没有，典型的“程度加深”，原文没有说“很长时间”，选项中有，这就属于“程度改变”，即便其他内容均与原文一致，这个选项也是错误选项。
B)They can absorb sunlight right after their birth.
与前面类似，原文没有absorb，而且没有after their birth，更重要的是after birth（紧跟……）原文根本没有，典型的“程度加深”。
C)They can survive without algae for quite some time.
与前面类似，for quite some time（相当长时间），原文根本没有，典型的“程度加深”。
D)They can produce chlorophyll on their own.
对应原文的retain the ability to produce their own chlorophyll；retain（保留）the ability to do sth. = do sth. own one’s own，完美选项。
再来从精读的层面看看这部分：
题干：What does the author say about baby sea slugs?
翻译：作者对幼年海蛞蝓有何描述？
文段：
Their babies retain the ability to produce their own chlorophyll, though they can’t generate energy from sunlight until they’ve eaten enough algae to steal the necessary genes, which they can’t yet produce on their own.
retain /rɪˈteɪn/，保留
not……until，直到……，才……，在……之后，才……
steal，偷窃
yet，尚（用于否定句）
翻译：它们的幼体保留了制造叶绿素的能力，但只有在摄食足够藻类、窃取到自身尚无法生成的必需基因后，才能利用阳光制造能量。
看看选项：
A)They can live without sunlight for a long time.
live，存活
翻译：它们可以在没有阳光的情况下长期生存。
B)They can absorb sunlight right after their birth.
absorb /əbˈzɔːb/，动词，吸收
翻译：它们一出生就能吸收阳光。
C)They can survive without algae for quite some time.
survive /səˈvaɪv/，存活，幸存
翻译：它们在没有藻类的情况下也能存活相当长一段时间。
D)They can produce chlorophyll on their own.
on one’s own，独立地，依靠自己
翻译：它们能够自行制造叶绿素。
简单小结一下这题的词汇
retain /rɪˈteɪn/，保留
not……until，直到……，才……，在……之后，才……
steal，偷窃
absorb /əbˈzɔːb/，动词，吸收
survive /səˈvaɪv/，存活，幸存
on one’s own，独立地，依靠自己
好了，今天就说到这里吧。
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