题目

词汇运用，根据句意及首字母或汉语提示完成单词。1. He ran so fast that I couldn’t c up with him. 2. Hello, Nancy, I’m g to meet you again. 3. She r his invitation to the tea party because she was really busy. 4. Thank you for (打印)the article for me. 5. Let’s go to the (音乐会)on Friday night. 答案：1. catch 2. glad 3. refused 4. printing  5. concert20．函数y1=log2（3x-1），y2=log2（2x），求x的取值范围，使得：（1）y1=y2；     （2）y1＜y2．