“慈母手中线，游子身上衣。临行密密缝，意恐迟迟归。谁言寸草心，报得三春晖。”唐朝诗人孟郊的这首诗说明了：

①父母对子女的爱是世界上最无私、最真挚的爱

②孝敬父母是中 * * 的传统美德  

③对父母的养育之恩我们唯有以爱和孝敬来回报

④不孝敬父母是违法的

A．①②③

B．②③④

C．①②④

D．①③④

Backing means the wind（）.

A.is changing clockwise in direction

B.is changing anticlockwise in direction

C.is changing cyclonically or variably in direction

D.remains unchanged in direction at the time