车辆驶近人行横道时，应怎样做？
A．加速通过
B．立即停车
C．鸣喇叭示意行人让道
D．先减速注意观察行人、非机动车动态，确认安全后再通过
参考答案：D
世界最大的热带雨林区位于（ ）
A．亚洲
B．南美洲
C．欧洲
D．南极洲
When something is on fire. People throw sand (沙子) on it to put out the fire. The main use of the sand is to
________. [ ]
A. protect the thing on fire.
B. add weight to the thing on fire.
C. keep the air away from the thing on fire.
D. lower the temperature of the thing on fire.
