---Is the Great Wall a wonderful place?---Yes tourists come here for a visit every year.A

问题补充：

---Is the Great Wall a wonderful place?

---Yes, tourists come here for a visit every year.

A. thousand of

B. thousands of

C. thousand

D. thousands

答案：

A. thousand of

(答案→)B. thousands of

C. thousand

D. thousands

解析：thousand“千”的用法是：如果前面有具体的数字，就不能用复数，也不能加of；如果没有具体数字，就要用复数，并跟of。根据本空的位置可知，故应该用thousands of。所以本题选B。