单项选择题According to the passage, a sunscreen can be described as all the following EXCEPT______.
单项选择题Over time, flavors of ______beers change more quickly.
单项选择题Which of the following is most likely to be the subject of study by a geohydrologist
单项选择题Who built large brick pyramids______
单项选择题Which of the following is the writer implying in paragraph 5