青春期身体生长发育快，所以在青春期要加强[ ]
A．营养
B．卫生
C．锻炼
D．休息
答案：A
一个多边形的每个外角都等于60°，这个多边形的内角和为______．
In the park , the number of the visitors is tightly ____ to avoid damaging the environment or putting stress on the animals.
A．limited
B．intended
C．expected
D．encouraged
