A.每年三月的第一个星期日举行艾迪塔罗德狗拉雪橇比赛。
B.山姆在阿拉斯加动物园观看鲸鱼、海狮和北极熊。
C.山姆的家人在比赛前试着自己坐雪橇。
D.山姆一家去山顶滑雪场和北极谷滑雪场滑冰。
A.根据第四段1-2行:
The next day, Sam and his family also decided not to miss the Iditarod Trail Sled Dog Race. The event happens on the first Saturday of March each year. 第二天,山姆和他的家人也决定不错过艾迪塔罗德狗拉雪橇比赛。该活动在每年3月的第一个星期六举行。
可知是在星期六而不是星期日举行,A错误;
B.根据第二段1-2行:
They went to the Alaska Zoo and saw different animals such as moose, snow leopards, and polar bears. 他们去了阿拉斯加动物园,看到了不同的动物,如驼鹿、雪豹和北极熊。可知,B错误;
C.根据第四段最后一句:
A week before the race, Sam and his family had so much fun touring the kennels and trying to ride the sleds thernselves!
比赛前一周,山姆和他的家人玩得很开心,他们参观了狗舍,还试着自己坐雪橇!
可知山姆的家人在比赛前试着自己坐雪橇,C正确;
D.根据第二段最后一句:
They also went skiing at the Hilltop Ski Area and Arctic Valley Ski Area. 他们还去了山顶滑雪场和北极谷滑雪场滑雪。
可知他们去滑雪了,而不是滑冰,两者为不同的项目,前者使用滑雪板,后者使用滑冰鞋,D错误;
故选C。