脑力劳动者的早餐需含有
A. 碳水化合物
B. 蔬果
C. 鸡蛋
D. 肉类
In 1981 the WTO has urged national tourism organizations ______ foreign nationals in their country as domestic travelers.
Local people usually see tourism as _______.
高温环境主要造成人体的代谢紊乱。
A. 循环系统
B. 内分泌系统
C. 呼吸系统
D. 水盐代谢