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题库 / OG2016-SC-118
Although appearing less appetizing than most of their round and red supermarket cousins, heirloom tomatoes, grown from seeds saved during the previous year—they are often green and striped, or have plenty of bumps and bruises—heirlooms are more flavorful and thus in increasing demand.
Although appearing less appetizing than most of their round and red supermarket cousins, heirloom tomatoes, grown from seeds saved during the previous year
Although heirloom tomatoes, grown from seeds saved during the previous year, appear less appetizing than most of their round and red supermarket cousins
Although they appear less appetizing than most of their round and red supermarket cousins, heirloom tomatoes, grown from seeds saved during the previous year
Grown from seeds saved during the previous year, heirloom tomatoes appear less appetizing than most of their round and red supermarket cousins
Heirloom tomatoes, grown from seeds saved during the previous year, although they appear less appetizing than most of their round and red supermarket cousins
题目分析：
本题虽然长，但是在把语句结构弄清的情况下十分容易找到正确答案。破折号之间可以添加句子（如本题），也可以添加词或者短语，均没有语法错误。
选项分析：
A选项：although appearing less appetizing than most of their round and red supermarket cousins是伴随状语，其主句的主语为heirloom tomatoes，这些都没有问题。但是，主句有两个主语（两个heirloom tomatoes），这在语法上是不正确的，一个句子只能有一个主语。
B选项：Correct. 本选项在语法和逻辑上均是正确的。
C选项：主句拥有两个主语，该错误同(A)。
D选项：本选项的两个主句间缺少连词（两个主句分别为appear句和flavorful句）。
E选项：主句拥有两个主语，该错误同(A)。（本选项中although they appear less appetizing than most of their round and red supermarket cousins为插入语）
1.句子结构，破折号内相当于是插入语，就算去掉，剩下部分也是完整的句子才对，而后半句已经是完整的句子了，前半句应该是修饰词，或者是从属从句，或者是带并列词的完整句子。
ACE没有谓语（或者说主语重复），直接排除。
D是一个完整的句子，但是前后两个都是完整的句子，却没有并列连接词，属于run-on错误，D错。
注意：分号可以连接两个完整的句子。
这里为啥要用破折号而不用逗号，破折号可以插入句子，表示是对前面的解释。但是两个逗号之间插入一个句子，就可能会导致语法结构错误。
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