挂在“树梢上的那个孤零零的小火柿子”出现在下列哪篇散文作品中？（）
A.《拣麦穗》
B.《我与地坛》
C.《秦腔》
D.《法门寺》
参考答案：A
Teachers, train drivers, oil refinery workers and other French employees have _____to strike in protest of President Sarkozy’s pension (养老金) reforms.
A．connected
B．united
C．joined
D．attempted
设a，b，c为正实数，试证明
