贲门失弛缓症的主要症状为________________、__________________。
参考答案：间歇性吞咽困难、胸骨后沉重感或阻塞感
-Shirley, I know you __________ a book about China. Have you finished it?
-Not yet. Maybe next year.[ ]
A. wrote
B. have written
C. are writing
D. will write
《中 * * 党党旗党徽制作和使用的若干规定》规定，中 * * 党党徽为（）组成的图案。
A、镰刀
B、斧头
C、五星
D、锤头
