反映骨吸收的标志物的是（）
A.Ⅰ型胶原C－端前肽
B.交联区C－端肽
C.骨碱性磷酸酶
D.骨钙素
E.骨谷氨酰基蛋白
参考答案：B
—Students should ______ to smoke or drink.
—I agree. They are bad for their health.[ ]
A. be allowed
B. not be allowed
C. be asked
D. allowed
简述皮格马利翁效应。
