要求:1.受欢迎的原因至少写三点;2.80词左右,可适当发挥;短文开头和结尾已给出,不计入总词数。
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The drivers have to _______ the traffic rules and control themselves if they want to be safe on the road.
小明通过仔细观察,发现简单机械在生活中有很多实际应用,如:指甲钳、剪刀、钥匙等。将图所示的钥匙插入锁孔转动开锁时,钥匙就相当于一个 ____ (选填“杠杆”、 “滑轮”或“轮轴”),属于____ (选填“省力”或“费力”)机械。
下列描述,表示气候的是( )