Dr. Smith, together with his wife and daughters,（）visit Beijing this summer.

单项选择题We don't know why so many people in that region like to wear dresses of such （）colors.

A. low
B. humble
C. mild
D. dull

单项选择题平时我们所讲的举一反三、触类旁通、闻一知十等是典型的( )形式。

单项选择题—Why does the Lake smell terrible — Because （）large quantities of water.

A. have polluted
B. is being polluted
C. has been polluted
D. have been polluted

单项选择题以普及家庭教育知识、提高家长教育水平，促进家校有机结合的家校联系形式是( )。

单项选择题普通中小学教育的性质是( )。