D．Mr and Mrs Ostrofsky are tired because their five daughters are in different colleges.

　　答案　C　[主旨大意题。根据第三段．..but having their children spread throughout the US created another expense...和整段内容可知答案为C。]

　　________．

　　C．adventure

　　D．attempt

　　答案　B　[词义猜测题。根据第四段It's time to think about what we can do.Perhaps we'll take a vacation 可知夫妻俩决定在最小的女儿也出去上大学后做个“短暂休息”故答案为B。]

　　B

　　(食松) is one of the most important tree species in the American West, .

　　Jays (松鸦) are important spreaders of pinyon seeds.Each fall, covered.Instead, they come out and form the next generation of trees.

　　The researchers conducted their study in a woodland of New Mexico.They spread 20 seeds under each of 12 pinyons梥ix in quiet spots and six in loud areas.Every day for three days, the tealm came back to each tree to see how many seeds had been eaten and to replenish (补充) some.They found quieter areas of the woodland were more likely to have jays and four times more with pinyon seedlings than loud regions.Meanwhile, the mice that lived in the louder environments ate more seeds there, destroying them in the digestive process.The results suggest noise might influence the ability of pinyons to survive from generation to generation.

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