题干：51 What is the distinctive feature of a sea slug?
A)It looks like both a plant and animal.
B)It converts some sea animals into plants.
C)It lives half on animals and half on plants.
D)It gets energy from both food and sunlight.
其余选项：
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?
55.What do we learn about sea slugs from the passage?
对比选项，distinctive features独一无二，定位词；sea slug，多次出现，背景词。
在找到各个题目的定位词，切分文章之后，定位到文章下面这部分：
(1)When we think of animals and plants, we have a pretty good way of dividing them into two distinct groups: one converts sunlight into energy and the other has to eat food to make its energy. (2) Well, those dividing lines come crashing down with the discovery of a sea slug (海蛞蝓) that’s truly half animal and half plant.
逐个对照选项：
A)It looks like both a plant and an animal.
B)It converts some sea animals into plants.
C)It lives half on animals and half on plants.
D)It gets energy from both food and sunlight.
A选项，plant，animal原文有，但是look like没有，排除。
B选项，convert有，但是注意原文convert后面是sunlight into energy，而且原文没有sea animal，一定要看清楚，选项有比原文多出的部分，都一般都是错误选项！
C选项，原文没有live…on，这里一定要仔细，原文是half animal而不是half on animals，一定要记住，选项有比原文多出的部分，都一般都是错误选项！
D选项，energy有，food有，sunlight有，原文也存在表示并列的and，正确选项。
再来从精读的层面看看这部分：
51 What is the distinctive feature of a sea slug?
distinctive /dɪˈstɪŋktɪv/，独特的
feature，名词，特点
翻译：海蛞蝓的独特特征是什么？
(1)When we think of animals and plants, we have a pretty good way of dividing them into two distinct groups: one converts sunlight into energy and the other has to eat food to make its energy.
distinct /dɪˈstɪŋkt/，有区别的，不同的
convert /kənˈvɜːt/，转换；convert A into B，将A转换成B
sunlight，太阳光
翻译：每当论及动植物，我们总能清晰地将其划分为两大阵营：一类将阳光转化为能量，另一类则必须通过进食获取能量。
(2) Well, those dividing lines come crashing down with the discovery of a sea slug (海蛞蝓) that’s truly half animal and half plant.
dividing line，分界线
come crashing down，突然崩塌；crash /kræʃ/，崩溃
翻译：然而，随着一种真正堪称“半动物半植物”的海蛞蝓的发现，这些界限轰然倒塌。
注：这里with……，with引导伴随状语，表示“随着……”；that引导的是定语从句。
看看选项：
A)It looks like both a plant and an animal.
翻译：它看起来既像植物又像动物。
B)It converts some sea animals into plants.
翻译：它将某些海洋动物转化为植物。
C)It lives half on animals and half on plants.
live on…，以……过活
翻译：它一半靠动物为生，一半靠植物为生。（它既吃动物也吃植物。）
D)It gets energy from both food and sunlight.
翻译：它从食物和阳光获取能量。
简单小结一下这题的词汇
核心词汇：
distinctive
feature
distinct
convert
sunlight
dividing line
come crashing down
live on…
好了，今天就说到这里吧。
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