顿咳好发年龄哪项是正确的（）
A.1岁以内
B.2岁以内
C.3岁以内
D.5岁以内
E.7岁以内
参考答案：D
－Have you ever seen the film "The Founding of A Republic"?
－______ . However, I hear there are many stars in it.
A．Yes, I’ve seen it once.
B．Yes, I have ever.
C．Not exactly. Is it good?
D．Never. I have no time.
几何画板软件中要调用深度迭代选项，须按住（）键不放，然后单击【变换】菜单，选择【深度迭代】
A.Shift
B.Ctrl
C.Alt
D.Ctrl+Alt
