高等继续教育 / 大学英语（本二）
Directions: Fill in the blanks with the words given below. Change the form if necessary.
[formidable; ravage; lucrative; crucial; vibrant; hemisphere; dynamic; foster; maritime; surpass]
10. Despite the improvement in influenza vaccines, influenza is expected to remain a _ _ _ _ _ _ oppoent of human health.
参考答案：