They are going to Dalian _________ a school trip in the summer holiday.
A:for
B:to
C:at
D:with
— It's about 10 kilometers.
请根据图中的信息,解答下列问题:
认为“一切事物都有对立面”的思想家是____ ;主张“兼爱”、“非攻”的思想家是____ 。
下列物质中,不属于合金的是( )