你知道“Is your friend a boy or a girl?”是什么句式结构吗?它看上去像一般疑问句,其实是一个选择疑问句,那么一般疑问句与选择疑问句有什么差异呢? Did you know that “Is your friend a boy or a girl?” Is a syntactic structure? It looks like a general interrogative sentence, which is actually a selective interrogative sentence. What is the difference between a general interrogative sentence and a selective interrogative sentence?