A:全国青年电视舞蹈大赛上,少数选手在综全素质考查中表现欠佳,令人大饱眼福.
B:校际联欢会上,来自不同学校的几十名同学携手同欢,共话未来,享受天伦之乐。
C:同志之间应互相关心,以诚相待,如果只想坑害别人,必然是搬起石头砸自己的脚。
D:刚刚在第49届世乒赛上全部囊括5项金牌的男女国手们胜利凯旋,回到北京。
烧红的铁块在冷却过程中,它具有的内能( )
“I sometimes get up at three or four in the morning and I surf the net.” “I often check my e-mail forty times a day.” “I often spend more than three hours during one time on the net.” “I spend more time in chatting rooms than with my 'real-life' friends.” Do you know any people like these? They are part of a new addiction(瘾) called Internet addiction. Internet addicts spend at least thirty to forty hours online every week. The use of the Internet can be an addiction like drug(毒品) use. People lose control of the time they spend on the Internet. For example, one college student was missing for several days. His friends were worried, and they called the police. The police found the student in the computer lab: he was surfing the net for several days straight. Studies show that about 6% to 10% of Internet users become addicted. And people worry about the teens because the Internet is changing the playing field for some of them. They spend more time in cyberspace than in the real world of friends and family. Is 'surfing the net' a hobby or an addiction for you? You may have a problem if you have these symptoms(症状): ●You do not go to important family activities or you do not do school work because you like to spend hours on the Internet. ●You can't wait for your next online time. ●You plan to spend a short time online, but then you spend several hours. ●You go out with your friends less and less.
假设你生活在半坡原始居民时代,在猎获一头野羊后,要把羊肉分割成小块,你所使用的工具是( )
杜鹃将卵产在苇茑鸟的鸟巢中,苇茑代为孵化和育雏,这种行为是( )