内分泌腺无(),其分泌物称为(),直接进入血液循环。
参考答案:导管;激素
The rich shouldn't________their wealth. Instead, they should contribute more money to the poor.
A.show off
B.take off
C.put off
D.give off
下列Java常见事件类中哪个是鼠标事件类 ( )
A.InputEvent
B.KeyEvent
C.MouseEvent
D.WindowEvent