2. Scientists are confident about the formation of coal, but they do not seem so sure when asked about oil.-湖北继续教育网网校

[单选题]2. Scientists are confident about the formation of coal, but they do not seem so sure when asked about oil.

A科学家们确实知道煤是怎样形成的，但要是问他们石油是怎样形成的，他们似乎就不那么有把握了。

B科学家们对煤的形成非常有信心，但是当被问到石油的形成时，他们好像没有那么确信。