----How amazing Sara! You are used to going to bed early and getting up early these days.

问题补充：

----How amazing, Sara! You are used to going to bed early and getting up early these days.

---- And I hope you can lead such a healthy life, too.

A. So do I

B. So I do

C. So I am

D. Thanks a lot

答案：

A. So do I

B. So I do

(答案→)C. So I am

D. Thanks a lot

解析： So do I我也一样； So I do.确实是这样；So I am.确实如此；Thanks a lot

多谢；句意：这些天你习惯了早睡早起，太令人惊讶了，萨拉！——确实如此，我希望你也能过着这样健康的生活。上文用的是助动词be，故选C。