问题详情

A group of top Chinese scientists will ______.
A. visit the U. S. and Western Europe to improve the ties between China and them
B. come closer to the U. S. and Western Europe
C. close the door of China to the U. S. and Western Europe
D. improve the ties between the U. S. and Western Europe请帮忙给出正确答案和分析，谢谢！