人口承载能力乐观论认为现在的环境污染和退化都是暂时的。
参考答案：对
天使蛋糕的基本用料是（）及少量的盐、香料、塔塔粉等。
A、蛋清、糖、面粉
B、全蛋、糖、面粉
C、蛋黄、糖、面粉
D、全蛋、油脂、糖
A．The heart pumps blood in two directions,
B．The blood is circulated round the body in one direction only by the pumping action of the heart.
C．The blood moved with a backward and forward motion.
D．The heart pumps blood in all directions.
