问题
选择题
若集合A={x|0<x<2},函数f(x)=log2(x-1)的定义域为集合B,则A∩B等于( )
A.(-1,2)
B.(0,1)
C.(0,2)
D.(1,2)
答案
∵A={x|0<x<2},
又由对数的意义可得x-1>0,∵B={x|x>1},
∴A∩B={x|1<x<2}.
故选D.
若集合A={x|0<x<2},函数f(x)=log2(x-1)的定义域为集合B,则A∩B等于( )
A.(-1,2)
B.(0,1)
C.(0,2)
D.(1,2)
∵A={x|0<x<2},
又由对数的意义可得x-1>0,∵B={x|x>1},
∴A∩B={x|1<x<2}.
故选D.
根据新闻报道,每年全国在餐馆里被倒掉的食物估计可养活2亿人。中国开展了“光盘”运动。请以“Against Food Waste”为题,用英语写一篇短文。短文应包含以下内容:
2.词数150 左右。开头已经写好,不计入总词数。 3.参考词汇:好客hospitality;打包make a doggie bag Against Food Waste According to reports, the leftovers in restaurants across the country are almost enough to feed 200 million people annually. Therefore, China has taken on a national campaign “Eat up all on the Plates”. |