道路运输驾驶员谨慎驾驶的三条黄金原则包括（）。
A.保持安全速度
B.集中注意力
C.仔细观察
D.提前预防
参考答案：B, C, D
用所给单词的适当形式填空。
1. Which do you like _____(well), a cat or a dog?
2. What fruit do you like _____(well)?
3. I think oranges are _____(juice) than bananas.
4. The machine is a great _____(helpful) in making cakes.
5. Could you tell me what the _____(different) is between a horse and a mule?
消费者的消费性质是（）。
A.生活消费
B.生产消费
C.生产消费或生活消费
D.精神消费
