下列磷脂中哪一种分子中含有胆碱（）。
A.脑磷脂
B.卵磷脂
C.磷脂酸
D.脑苷脂
E.心磷脂
参考答案：B
People who tend to focus on ______ while speaking a foreign language may find that they
worry too much about making mistakes.[ ]
A. fluency
B. agency
C. policy
D. accuracy
动物肌肉内糖类的存在形式为
A．葡萄糖B．乳糖C．半乳糖D．糖原E．淀粉
