著名的崇圣寺三塔屹立在美丽的苍山与洱海之间(见下图)。这一遗迹是唐朝与哪一少数民族经济文化交流的见证
A.南诏
B.突厥
C.回纥
D.吐蕃
答案:A
It is the experience he had as a boy ______ has formed his present personality.
A.that
B.what
C.which
D.who
物体做平抛运动时,它的速度方向与水平方向的夹角α的正切tanα随时间t变化的图象是如图中的[ ]
A.
B.
C.
D.