What made Dr. Schlaug surprised?

(单选题)Taking a close look at their respective historical contexts, (单选题)Our city has experienced ______ this year as it did last yea (单选题)—What do you think of French?—In my opinion, French is _____ (单选题)—Jack, you erase the blackboard today, ______?—But I did it (单选题)It is ______ for him to get to school on time, because it is (单选题)Standing on the top of the Oriental Pearl TV Tower, ______ a (单选题)Large amounts of water ______ in the past five years. (单选题)The country has sent up three manned spacecraft, the most re (单选题)I find painting and listening to music ______. (单选题)______ 6 world powers have accepted ______ Iranian offer for