题目

单项选择 从每小题A、B、C、D中选出一个能填入句中空白处的最佳答案。 This is         3-D printer. And this is an artificial (人工的) ear. Can you believe that scientists printed this artificial ear by this 3-D printer? A. a                          B. an                            C. the                           D. /句型转换。1 It’s in the east of China.(变为一般疑问句)______________________________________________ .2 What a big map of the US! (改成同义句)________________ the map of the US is!3. Houston is in the south. (对划线部分提问)_______________________________________________