It worried her a bit ______ her hair was turning grey.

(单选题)A sound scientific theory should be one that _________. (单选题)The underlined part in the passage shows ________. (单选题)What makes a scientist according to the passage? (单选题)Directions: In each of the following group of words, there i (单选题)What made the author feel honored? (单选题)Why did the author accept writing technology reviews eagerly (单选题)What does the author say about her son in Paragraph 3? (单选题)What did the author think of her son’s advice? (单选题)According to Dr Ruth Mayo, one’s facial appearance is basica (单选题)What can we learn from the eight studies?