课程资源按存在方式区分，可以分为（ ）。

(单选题)We look forward to receiving your reply ______ this letter, (单选题)You can try the convenience store, but it ______ well be clo (单选题)Which would be the best title for the passage? (单选题)The study is beneficial to know ______. (单选题)In the second paragraph, the underlined word “vanished” prob (单选题)Before the study, which of the following was unclear? (单选题)What will probably happen to the three ladies after this tes (单选题)According to the passage we can infer that ______. (单选题)How did the third lady know the suspect was wearing contact (单选题)Which of the following cannot be concluded from the passage