若函数$y=\sqrt{3}{\sin }^{2}x+\sin x\cos x-\frac{\sqrt{3}}{2}$的图象关于直线$x=\phi$对称，则$x=\phi$可以为（    ）

随着现代通信技术的发展，世界会变得____，你我变得____，生活变得____。

下列属于器官的是（　　）

短文改错。

    Jim Green teaches our ____ English. He has been in China for more than two year____. He has been to many interesting places in Beijing, and____  he has not yet been to many others ____ parts of China. Last week he goes ____ to Mount Emei in Sichuan Province with his family. Many people like travel ____ by air, but Jim ____ family think that traveling by train is the best. It is much cheap ____ and far more enjoyable than a rushing trip by air. He ____ had a wonderful train ride to Chengdu after ____ they went to Mount Emei by bus.

一定量的水和酒精混合总体积变小，是由于分子之间存在____ ；两块表面干净的铅块互相压紧能够吊住重物，说明分子间存在____．