【单选题】下列5个算式中,错误的有 ①a 2 b 3 +a 2 b 3 =2a 4 b 6 ②a 2 b 3 +a 2 b 3 =2a 2 b 3 ③a 2 b 3 ·a 2 b 3 =2a 2 b 3 ④a 2 b 3 ·a 2 b 3 =a 4 b 6 ⑤2a 2 b·3a 3 b 2 =6a 6 b 2 [ ]
【简答题】完形填空 。 It rained for four days. Mike couldn't go out and 1 with his friends. His parents went to work and had to 2 the boy at home. They bought some 3 for him. But he didn't like to read them. He stoo...
【简答题】Daniel Olin was 11 years old when his parents moved to Canada. He liked his new school and made friends there, but then things at home started to change. His mum and dad began to argue and the argumen...
【简答题】It rained for days.Mike couldn’t go out and with his friends.His parents went to work and had to the boy at home.They bought some for him.But he didn’t like to read them. He stood by the window(窗户)and...