农业总产值是农林牧副渔四业产值相加之和。（）
参考答案：对
They asked me to perform a comedy ______ A Trip to Beijing. [ ]
A.called
B.calling
C.calls
D.is called
肺动脉狭窄的临床表现可有（）
A.昏厥
B.乏力
C.劳累后气急
D.心悸
E.水肿
