世界上最大的黄土堆积区是（　　）

在食物中有我们身体所需要的各种营养物质有机物，能够提供身体所需要的能量．这些能量被释放出来是通过（　　）

根据中文或首字母写出单词，使句子完整准确。
What he said was already____ (记录) by the police.
Congratulations! You've answered all the questions____ (正确地).
Mr Wu received a present from his friend, but he didn't a____ it..
The camera was one of the greatest ____ (发明)in the world.
You have to be p____ enough to wait for your turn.
Now people eat____ (health) than before and many of them pay much attention to doing sports after work.
The boy____ (take) to hospital at once after he fell off the tree.
we must do what we can____ (save) the girl. She is too young.
We hope that more charity shows____ (hold) to raise money for Project Hope.
The boy considered ____ (he) as the smartest boy in his class.

如图所示为一物体沿东西方向（以东为正向）作直线运动的速度时间图象，由此图象可以判断出（    ）