连线：请把下列生物现象与其所反应的生物特征用线连接起来 ①含羞草受到刺激时小叶片
题型：解答题
问题：
连线：请把下列生物现象与其所反应的生物特征用线连接起来
①含羞草受到刺激时小叶片合拢 A．生物的生活需要营养
②人每天要排尿、出汗 B．生物能进行呼吸
③啄木鸟每天要捕食大量森林害虫 C．生物能排除身体内产生的废物
④小树能有小长大并开花结果D．生物能对外界刺激做出反应
⑤海豹每隔一段时间就要浮到水面上换气 E．生物能生长和繁殖．
题型：解答题
“There is an out – of – date idea that children grow up and leave home when they’re 18,and the truth is far from that,” says Mr．Larry Bumpass of the University of Wisconsin．Today unexpected numbers of young adults are living with their parents．“There is a great change in the middle class,” declares Allan Schnaiberg of Northwestern University, whose son, 19, moved back in after an absence of eight months．
Scientists show a number of reasons for this return to the nest．The marriage age is rising, a condition that makes home and its pleasantness particularly attractive to young people．A high divorce （离婚） rate and a low remarriage rate make some differences．For some, the expense of an away - from - home college education has become so great that many students now attend local schools．Even after graduation, young people find their wings tied by terrible housing costs．
Living at home, says Knighton, a school teacher, continues to give security （安全保卫） and moral（道义的） support．Her mother agreed．“Its strange for the kids to pay all that money for rent．It makes sense for kids to stay at home．” But sharing the family home requires changes for all．There are the hassles over bathrooms, telephones and privacy．Some families, however, manage the careful balancing act．But for others, it proves too difficult．Michelle Del Turco, 24, has been home three times and left three times．“What I considered a social drink, my dad considered an alcohol （酒精） problem,” she explains．“He never liked anyone I dated, so I either had to hide away or meet them at friends' houses．”
Just how long should adult children live with their parents before moving on? Most scientists feel lengthy homecomings are a mistake．Children, can end up with a sense of defeat and failure．And aging parents,
who should be enjoying some freedom, find themselves stuck with too many things．Many agree that brief visits, however, can work well．
小题1:According to the author, there w
as once a trend in the U．S．________．
A．for young adults to leave their parents and live separately
B．for middle class young adults to stay with their parents
C．for married young adults to move back home after a lengthy absence
D．for young adults to get jobs nearby in order to live with their parents小题2:Which of the following does not lead to young adults returning to the nest?
A．Young adults find housing costs too high．
B．Young adults are not old enough．
C．Young adults look for parental comfort and support．
D．Quite a number of young adults attend local schools．小题3:The underlined word “hassles” in the passage probably means _________．
A．agreements
B．worries
C．disadvantages
D．quarrels小题4:According to the passage what is the best for both parents and children?
A．They should share the family expenses．
B．Children should leave their parents when they are grown up．
C．Adult children should live away from their parents and visit their parents from time to time．
D．Parents should support their adult children when they are in trouble．小题5:．One of the disadvantages of young adults returning to slay with their parents is th
at ______．
A．there will certainly be inconveniences in even-day life
B．most parents find it difficult to keep a bigger family going
C．the young adults try to be overprotected by their parents
D．public opinion is against young adults staying with their parents