The best title for the passage would be ________.
时间：2020-05-14
人气：2059
The author tells us in paragraph 4 ________.
人气：2949
Paragraphs 2 and 3 explain ________.
人气：2899
Advertisements are aimed at people suffering from mild complaints because________.
人气：2320
The first paragraph is intended to ________.
人气：552
