题目

完形填空Molly spent her summer vacation in China with her parents last year. They visited a lot of famous _1_, such as Beijing, Guangzhou and Shanghai. She __2__ Beijing for a week. She __ 3__ the Palace Museum, the Great Wall, Tian’an Men Square __4_ the Summer Palace. They _5__ went to the zoos and the parks._ 6__ was cloudy, but not rainy, so it _ 7__ not too hot. They __ 8__ great fun playing in the zoos and the parks. Molly learnt a lot __ 9_ Chinese history. She said, “It is interesting to visit China. I __10_ China very much.”1. A. parks   B. gardens     C. cities   �如图所示，利用滑轮组匀速拉动放在水平地面上的重为300N的物体，摩擦力的大小为60N．如果不计滑轮和绳的重力、滑轮与绳间的摩擦力，那么绳端的拉力、物体对地面的压力分别为（　　）A．60N、300NB．30N、300NC．60N、240ND．90N、210N