分子系统发生分析的对象往往是一组同源序列(homolog)。非同源序列的进化过程不能代表生物体的进化过程。
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构建系统发育树的方法可分为两类,基于距离的方法和基于字母特征的方法。
A. 对
B. 错
What does the IELTS prununciation assesment criteria not inlcude?
Accuracy
B. Accents
C. Range of features
What can sometimes confuse the sound of individual words?
A. Spelling
B. Meaning
C. Length
Word stress means making a specific syllable in a word___
A. Larger Writing
B. Stronger sound
C. Different colour