设，，则集合（ ）。

(单选题)已知集合，，则上述两个集合的交集中的整数元素个数为（ ）。 (单选题)The doctor ______ a medicine for my headache. (单选题)To develop light industry in a big way ______ to improving t (单选题)Jane is timid. Whenever she sees a mouse or a snake, she los (单选题)This is the ______ piano on which the musician created some (单选题)These proposals sought to place greater restrictions on the (单选题)30.（ ） (单选题)29.（ ） (单选题)28.（ ） (单选题)27.（ ）