A-A+
What is the passage mainly about？A．Manufacturi
问题详情
What is the passage mainly about？
A．Manufacturing the rinse.
B．The anti-smoking rinse.
C．The pilot study.
D．How to quit smoking.
参考答案
正确答案：B
解析：文章的主题很明确。文章一开始就介绍了新型产品，然后介绍它的功效试验过程及生产展望。选B。
考点：
