-1.9-9+11=1______．（判断对错）
∵-1.9-9+11=-10.9+11=0.1，
∴-1.9-9+11=1（×）；
故答案为：×．
Great changes ________ in China since the People’s Republic of China _________ in 1949.
A． have taken place; was founded
B． has taken place; was founded
C． have been taken place; founded
D． took place; founded
下列用于胃食管反流病维持治疗的药物中，效果最好的是
A．西沙必利
B．吗丁啉
C．氢氧化铝
D．奥美拉唑
