1.his robot is hard and smooth （划线部分提问 hard and smooth 是划线的.

the desk is hard and smooth.(对划线部分提问）（划线部分是 hard and smooth） 1 These apples are smooth and hard(划线提问 这是smooth and hard） 2.These boxes are hard and smooth.（对划线部分提问） The desk is (smooth and hard)对括号部分提问 It is （hard and smooth.)括号部分提问 The apples are hard and smooth.hard and smooth提问 It is smooth and hard These boxes arehard and smooth.(对hard and smooth提问) These apple are( smooth and hard)对括号部分提问 The desks are hard and smooth.用两种方法提问 This boy is working hard.划线部分提问,划线部分是working hard they are smooth and soft .(对smooth and soft部分提问)