单项选择。从每小题所给的四个选项中，选出一个最佳答案。 Some bo

单项选择。从每小题所给的四个选项中，选出一个最佳答案。

Some boys are playing________ soccer on the playground．How happy they are!

A．a B．an C．the D．／

答案

相关题目

Keep your child off drugs, ________ it will ________ many serious health a

Keep your child off drugs, ________ it will ________ many serious health and behavior problems. A. or; point to B. or; lead to C. and; point to D. and; lead to

我国劳动力约是美国、欧盟、日本劳动力总和的2倍，因此成

我国劳动力约是美国、欧盟、日本劳动力总和的2倍，因此成为“世界工厂”。但近些年来外商开始抱怨劳动力短缺、工资上涨过快，导致生产成本提高

从二次根式、、、、2、中任选一个，不是最简二次根式的概

从二次根式、、、、2、中任选一个，不是最简二次根式的概率是（） A． B． C． D．

向含S2﹣、Fe2+、Br﹣、I﹣各0.1mol的溶液中通入标准状况下的Cl

向含S2﹣、Fe2+、Br﹣、I﹣各0.1mol的溶液中通入标准状况下的Cl2，通入Cl2的体积和溶液中相关离子的物质的量关系图正确的是（） A． B． C． �

设数列是等差数列，是其前n项和，且，，则下列结论错误的

设数列是等差数列，是其前n项和，且，，则下列结论错误的是( ) A． B． C． D．和均为的最大值

Over the last 70 years, researchers have been studying happy and unhappy people

Over the last 70 years, researchers have been studying happy and unhappy people and finally found out ten factors that make a difference. Our feelings of well-being at any moment are determined to a

A When I was six, Dad brought home a dog one day, who was called “Brownie

A When I was six, Dad brought home a dog one day, who was called “Brownie”. My brothers and I all loved Brownie and did different things with her. Ore of us would walk her, another would feed

在正四棱柱ABCD—A1B1C1D1中，侧棱是底面边长的2倍，P是侧棱CC1

在正四棱柱ABCD—A1B1C1D1中，侧棱是底面边长的2倍，P是侧棱CC1上的任一点.（1）求证：不论P在侧棱CC1上何位置，总有BD⊥AP；（2）若CC1＝3C1P，求平面AB1P

单项选择。从每小题所给的四个选项中，选出一个最佳答案。 Some bo

答案

相关题目

最新题目