信息技术是第三次科技革命的突出成就,反过来又成为科技进步的强大助推器。比如有些生物实验,往往需要几个月时间才能完成;而用计算机模拟实验,不仅能迅速获得结果,而且能节约器材费用,还能避免某些真正实验所具有的危险性。上述事实说明( )
—_____ Mr Smith ____ this week? — No. He is on holiday.
Some of the students have already learned enough English to ____ a conversation with a native English speaker.
—Yangyang carried off the first winter Olympic _____ medal for China. —Great! What ____ she won for our motherland!
The US/UK war against Iraq and the suffering _____ caused have become a big concern all over the world.
It is partly _____ the summer day is longer that everything has a larger time to warm up.