题目

阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。 Class, please line up! Let's welcome Marti, said Ms. Baroni, our tae kwon do (跆拳道) teacher. I was excited that my best friend Marti would be taking lessons, too. Everyone said, Hi. Marti went red in the face. You don't need to be shy here, I said to Marti in a quiet voice. Everyone's really nice. After warm-up exercises, Ms. Baroni divided everyone into groups. Even though I was a level above Marti, Ms. Baroni told us to practice together. Jenna, why don't you show Marti some b1．---Many young people can't _________to buy houses in big cities in China．---Exactly．（　　）A．offerB．effortC．affectD．afford