大部分患者经过适当治疗达4~6周后,血脂可以降到目标水平,这时可以停药观察。
参考答案:错
Perseverance is a kind of quality-and that's ______ it takes to do anything well. [ ]
A. what
B. that
C. which
D. why
什么叫半音?什么叫全音?