Teenagers are known for being creative and full of new ideas． Let's have a look at these teenage inventions that might change the world．

（1）What is the passage mainly about　　？

A．Popular ads．

B． Useful machines．

C． Strange pictures．

D． Teenage inventions．

（2）The earthworm robot by David Cohen can　　．

A． make things stay fresh

B． help people wash clothes

C． go into the smallest places

D． take care of the old people

（3）Which of the following in TRUE　　？

A． Plates and cups are made of fresh banana leaves．

B． Remya's washing machine can also keep people fit．

C． David Cohen is a middle school student from India．

D． Kenneth's wearable sensors will keep old people at home．