不良生活方式对人们健康影响的特点？
参考答案：
一是潜伏期长，二是特异性差，三是协同作用强，四是变易性大，五是广泛存在
She is a bit shy and _______ stand up and answer the teachers questions.
A．doesn't dare to
B．dares not
C．dare not to
D．dares not to
