驾车起步、停车哪种做法更节省油耗？（）
A、急速起步、急速刹车
B、慢速起步、平稳刹车
C、慢速起步、急速刹车
D、急速起步、慢步刹车
参考答案：B
看图补全对话。
A: What's this, Li Ming?
B: It's a 1___________.
A: Yes, this is a map of our 2___________. We live in 3___________. We speak 4___________.
What is the 5___________ city of China?
B: It's Beijing.
A: Yes! Beijing is the capital city of China! What country is 6___________ of China? Do you know, Li Ming?
B: Yes, I 7___________. The U. S. is east of China.
A: What colour is our flag, do you know?
B: 8___________, I know. It is 9___________. It has 10___________ stars.
飞行扰流板/减速板系统有几个PCA？（）
A、2个
B、4个
C、6个
D、12个
