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124. What influence does smoking have upon driving?
A. Harmful for safe driving
B. Increase concentration
C. Help relaxation
D. No effect on driving
Answer：A
Previous question: 123. Which of the following is a bad habit when changing lanes?
Next question: 125. When driving on a long downhill road, which is the best way to control the speed?
2026年摩托车科目四英文版题库共345题，你可以免费查看前50题，完整版题库请添加微信购买：
The English version of the 2026 motorcycle subject 4 question bank has a total of 345 questions. You can view the top 50 questions for free. Please add WeChat to purchase the complete version of the question bank.
科目四试题
- When driving on a long downhill road, which is the best way to control the speed?
- When the tire pressure is too low, what can happen when driving at a high speed?
- Once inflammable gas causes a fire disaster, it should be put out with water in good time.
- When rescuing a wounded person who has been poisoned by toxic gas, the first measure is to send him to a place where air is fresh so that he will not continue to be poisoned.
- When a motor vehicle passes over an overflowing bridge, what should the driver do after stopping and observing closely?
- What is the meaning of this sign?
- When a wounded person suffering bone fracture in the thigh, shank and spine, it is necessary to keep the fracture in position and refrain to move the wounded person.
- What is the meaning of this sign?
- What is the meaning of this sign?
- What is the meaning of this sign?
- What should the driver do to follow other motor vehicles on a mountain road?
- When rescuing a wounded person suffering from bone fracture, which of the following should be kept in mind?
- When driving in thick or extremely thick fog, what should the driver do due to the low visibility in such weather?
- How to reduce speed or stop when driving on a road covered with snow and ice?
- When rescuing a wounded person in an emergency, it is necessary to firstly stop the bleeding by compression before other methods are taken according to the conditions of bleeding.
- When encountering a vehicle in front ascending on a mountainous road covered with ice and snow, what should the motor vehicle driver do?