某校七年级共320名学生参加数学测试,随机抽取50名学生的成绩进行统计,其中15名学生成绩达到优秀,估计该校七年级学生在这次数学测试中达到优秀的人数大约有( )
A:50人
B:64人
C:90人
D:96人
The Descendants of the Sun(太阳的后裔) that really ____ (earn) the praise(reputation)of K-drama fans. It made its debut(首映) on February 24, 2016 with an average of 13 percent in the Seoul National Capital Area. The next night, ratings ____ (go) up an average of two percent. ____ (apparent), those two episodes set up Descendants of the Sun as it dominated the competition with its third episode. ____ nationwide and Seoul National Capital Area for both TNmS Ratings and AGB Nielson, the K-drama earned over 20 percent viewership ratings(收视率).
For those ____ do not know what Descendants of the Sun is about, it is a drama about the love of people who get ____ (close) as they learn to be considerate of each other in desperate times. It is also about the sacrifices made by people who throw themselves ____ natural disasters. Captain Yoo Shi Jin(柳大尉) (Song Joong Ki宋仲基) is the team leader of the Special Warfare Command of the United Nations Peacekeeping Troops. By request of the UN, he is ____ (station) in the war-torn country of Uruk(乌鲁克). ____he meets Kang Mo Yeon(姜暮烟) (Song Hye Kyo宋慧乔), a volunteer doctor with Doctors Without Borders.____they work alongside each other, they clash and fall in love.
一个九位数,最高位是7,个级上都是0,其他数位上都是6,这个数是____,改写成以“万”为单位的数是____,省略万位后面的尾数是____,精确到亿位大约是____。
第一步,将若干只正常的小鼠,平均分为A、B两组。观察并记录小鼠的活动状况。
第二步,给A组小鼠注射适量的胰岛素溶液,给B组小鼠注射等量的生理盐水。一段时间后,A组小鼠会出现四肢无力、活动减少等低血糖症状,B组小鼠活动正常。
第三步,在A组小鼠出现低血糖症状后,分别给A、B两组小鼠注射等量葡萄糖溶液。一段时间后,A组小鼠恢复正常活动,B组小鼠没有明显变化。
请回答下列有关问题。
在方格纸上画出图形B和图形C.
图形A向下平移4个方格,再向右平移6个方格,得到图形B.
图形A点绕O顺时针方向旋转90°得到图形C.