答案　B　[细节理解题。由第五段中的Astronauts eat tortillas instead of bread because they make fewer crumbs可知，宇航员不吃面包，是因为面包屑会到处乱飞。]

　　24．We can infer from the passage that astronauts ______.

　　A．drink from cups and glasses

　　B．always wear diapers in space

　　C．can move freely during landing

　　D．must pay attention to the crumbs in space

　　答案　D　[推断判断题。由第五段中的Floating crumbs could get stuck in equipment or an astronaut’s eye可知，面包屑会钻到机器中或人的眼睛里，所以宇航员要格外注意。]

　　B

　　More than half of rich Americans have not shown their full wealth to their children，a new survey showed last Tuesday.

　　The survey，published by the Bank of America，studied the rich with $3 million or more in assets.It found that “surprisingly few of those surveyed have well­developed plans to preserve and pass on their assets to their children”．

　　The majority of the 457 people surveyed are self­made，first­generation rich.Fifty­two percent of parents have chosen not to tell their children just how wealthy they are，and 15 percent have given away nothing about the family wealth.One in three parents said they had never thought to do it.

　　They are worried that their children would become lazy，spend money freely，make bad decisions and even become a target for gold diggers.

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