鲨鱼是世界上唯一不患癌症的动物，研究发现其体内含有的角鲨烯（化学式为C30H50
题型：计算题
问题：
鲨鱼是世界上唯一不患癌症的动物，研究发现其体内含有的角鲨烯（化学式为C30H50）有抗癌作用。
试计算：
（1）角鲨烯（化学式为C30H50）中碳、氢两元素的质量比是_____________。
（2）41g角鲨烯（化学式为C30H50）与___________克水中所含的氢元素质量相同。
题型：计算题
请先阅读李雷给王老师的来信，然后帮助王老师给李雷回信。
Dear Miss Wang,
I live in a boarding school and I go home every weekend. But when I came back to school this Monday, I found my wallet with all my money and identity cards had been stolen. I haven’t told my parents because they will be angry. Now I have to borrow money from my classmates .I’m so sad that I cannot concentrate (集中注意力) on my studies. Can you help me?
Yours, 
Li Lei
注意：1. 给李雷至少两条建议；
2. 开头和结尾已经给出，不计入总词数；
3. 词数为80词左右。
Dear Li Lei,
I am really sorry that you lost your wallet.______________________________________
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I hope you will fi
nd these ideas useful.
Yours,
Miss Wang