生长猪半必需氨基酸一般是指（）、（）和丝氨酸。
参考答案：半胱氨酸；酪氨酸
Painting is a __________ of art as well as music and dance.
A．sign
B．manner
C．form
D．goal
The meeting___ last night was a great success and all the disagreements got ___.
A．to be held; settled
B．held; settled
C．holding; settling
D．being held; settled
