读下面地形图,回答和完成下列要求。
图中等高线所表示的属哪一种地形?()判断的理由是:海拔高度在()米以下;相对高度在()米以下。
参考答案:丘陵;300;60
在正四棱锥S-ABCD中,O为顶点在底面上的射影,P为侧棱SD的中点,且SO=OD,则直线BC与平面PAC所成的角是________.
---Where is your grandpa?
---He _________ Canada and __________ Toronto for a month.
A.has been to, has been in
B.has gone to, has been in
C.has been in, has been to
D.has gone to, has been to