--What's that noise? --Bob and his sister ________ computer games． A．have played B．are playing C．played D．will play
第三次科技革命似惊雷闪电迅速席卷整个世界，其影响之大是以往任何一次都无法比拟的。这次科技革命最为突出的核心技术是( )
---I’m not _____ up so early yet but I have to _____ myself to it. ---Yeah. Just as the saying goes,” An early bird catches the worm.” A .used to getting; adopt
下图为我国某盆地自然景观剖面图，读图回答1-3题。 1．根据图中信息判断，该盆地为 A．塔里木盆地 B．准噶尔盆地 C．柴达木盆地 D．四川盆地 2
A bank is the place ______ they lend you an umbrella in fair weather and ask for it back when it begins to rain. A. when B. that
Wang Fei，a Chinese student，and Mary，an American student studying Chinese in China，were in a supermarket. They saw a young man walking down the stairs. In his hurry，he missed the last two st
两角钱 肖复兴 有时只是举手之劳，就能帮助别人，但我们对好多举手之劳的事情却总是熟视无睹，而不愿意伸出手来。 那天下午，我去邮局寄信
、
满足：
，且
，若
，其中
且
，则
最小值是 ．
．