数学课上为了更好的帮助学生形成智力技能，在黑板上清楚而细致的演算例题，这是给学生（ ）。

(单选题)—Have you seen the movie the Wandering Earth?—Yes. It’s well (单选题)—Your father looks healthier than before!—Yes. He used to __ (单选题)______ people watch the raising of the national flag at Tian (单选题)China’s first home-built aircraft carrier(航空母舰)hit the water (单选题)There is ______ “u” and ______ “s” in the word “us”. (单选题)What do we know about the author? (单选题)The author began to get annoyed because ______. (单选题)What would be the best title for the text? (单选题)Which of the following sentence is true? (单选题)What does the underlined phrase mean?