What is the topic sentence?

每段的主题句是什么？

Do all the other sentences support the topic sentence?

其他的句子是否能够说明或支持主题句？

Did I begin each paragraph with a proper topic sentence?

我是不是每一段都有中心句？

The topic sentence and keyword in the sentences in segment.

段中主题句和句中的关键词。

Read the article and underline the topic sentence for each paragraph.

阅读短文，在每段的主题句下划上横线。