单选题函数y＝3sin的最小正周期是（ ）
单选题若1名女生和3名男生随机地站成一列，则从前面数第2名是女生的概率为（ ）
单选题Mary picked up her children’s clothes that ____on the floor.（ ）
单选题下列词语中加点字的读音全都不相同的一项是（ ）
单选题（ ）
单选题下列不等式成立的是（ ）
单选题函数的定义域为（ ）
单选题通读下面的短文，掌握其大意。然后，从每小题的四个选择项中选出可填入相应空白处的最佳选项。Eleanor Roosevelt was the wife of America’s 32nd president, Franklin Roosevelt.She helped her husband in many ways during his long21 life.She also became on
单选题将一颗骰子抛掷1次，则得到的点数为偶数的概率为（ ）
单选题阅读下列短文，然后根据短文的内容从每小题的四个选择项中选出最佳的一项。B Magic（魔法）often forces us not to believe our own eyes or even appears to be breaking laws of physics or nature! The word "magic" has many different meanings.When a
单选题等差数列中，若a1＝2,a3＝6,则a7＝（ ）
单选题函数是（ ）
单选题下列句子有语病的一项是（ ）
单选题阅读下列短文，然后根据短文的内容从每小题的四个选择项中选出最佳的一项。A In 2008, the United States Department of Agriculture USDA wanted to know if all the school lunches served to students were healthy.The answer was a big, fat NO!Th
单选题.（ ）
单选题－Would you like to go to the theadive with me tonight?－____, but I don’t think I can afford the time.（ ）
单选题过点(0，1)且与直线垂直的直线方程为（ ）
单选题My parents and I couldn't get into the house last night because ____ of us had the key.（ ）
单选题（ ）
单选题下列函数中，函数值恒为负值的是（ ）