下列关于交往的认识正确的是（    ）

下图是屈肘、伸肘状态图：

(1)图中①是____ 肌，②是____ 肌    
(2)当手臂处于A状态时，以____ 为主的屈肌肌群处于收缩状态。以____ 为主的伸肌肌群处于舒张状态。
（3）图B中，①和②的状态分别是____ 和____ 
（4）当手臂自然下垂时，①处于____ 状态，②处于____ 状态；
（5）提重物时，①处于____ 状态，②处于____ 状态；

    Sally is 76 years old. She has no sons 1 daughters. Her husband（丈夫） died(死) 15 years 2. But she didn't move into an old people's home. She would like to look after(照顾) herself . Every morning she gets up early and goes for a walk in the park. She likes doing sports in the park, too .When she does these things, She feels very 3.

    Every day she spends two hours 4 children with their math. And she was a popular 5 before she retired(退休) from a middle school. When the children come 6 help, she is always happy to help them. She often says to the children,“I'm so 7 to be with you. You are all my kids. ”

    When people ask her 8, she says,“I love children and 9 staying with them. Every kid is a 10 for me. ”