阅读下面短文，请根据所给中文正确拼写单词，使短文意思完整。每空限填一词。

First, they were two… now they are already six. Those noisy children are eager to travel around the world with their   小题1:   (父母). Yes, that’s possible with the Zapps who have started from Argentina to travel around the world since   小题2:   (一月) 23rd, 2000.

The big question being asked  小题3:   (被) the curious public is: “What prompted (促使)  小题4:   (他们) to travel around the world?” The couple’s answer is   小题5:   (总是) simple: “It’s just one wish — to travel around the   小题6:  (整个) world.”

Now, their footsteps have covered   小题7:  (多) than forty countries. With the help of the 1928 car from   小题8:   (英格兰), the couple along with the four kids have   小题9:   (面对) the challenges of the travels bravely .

So, even if you are not rich, you can be richer with all the memories like   小题10:   (到达) to new places and meeting new friends. Truly, each one of us can fulfill our dreams if we start now!

何谓溶解度？溶解度与哪些因素有关？溶解度曲线有何规律？