A:①②
B:②④
C:②③
D:③④
根据句意及首字母提示补全单词。(1)Four people are in my f____ . They are my parents, my sister and I.(2)Mr. Li wants to b____ a pair of pants in the clothes store.(3)—Could you help me with my English?—No p____ . (4)The boy is my uncle's son. He is my c____ .(5)—How do you say 6:15 in English?—It's a quarter p____ six.
小奇同学进行研究性学习,他搜集了“贞观之治”、“开元盛世”、“玄奘西游”、“鉴真东渡”的相关资料,由此可知他研究的课题是( )
在一个不透明的袋子中装有若干个除颜色外形状大小完全相同的球,如果其中有20个红球,且摸出白球的概率是15,则估计袋子中大概有球的个数 ____