______about wild plants that they decided to make a trip to Madagascar for further research.[ ] 

A. So curious the couple was

B. So curious was the couple

C. How curious the couple was

D. The couple was such curious

关于抽汽器的说法不正确的是( )。

A．抽汽器的作用是将凝汽器在运行中所积聚的不凝结气体抽出，以维持凝汽器中的真空度
B．凝汽器内的真空，是蒸汽分压力和各类气体分压力之和
C．只有气体被抽出，其分压力接近于零时，凝汽器的真空才是该空间蒸汽温度的饱和压力
D．抽汽器起动初期，真空度就已经很高了