It's pity that many wild animals are now in danger．Please have pity on them since they are part of our big family．（　　）

A．a；/B．a；aC．/；aD．/；/

Who is at the door？

A deliveryman（快递员） or wanting to sell his new products．（　　）

A．everybodyB．anybodyC．somebodyD．nobody

We have entered a world where robot operations become true with 5G technology．

Hard to believe! Scientists are full of which leads to great changes in our life．（　　）

A．attractionB．invention

C．positionD．contribution

It's a idea to build cabin hospitls（方舱医院） to receive patients during the outbreak of COVID﹣19（新冠肺炎）．（　　）

A．cheerfulB．classicalC．creativeD．curious

Song of Autumn by Liu Yuxi describes autumn in a different way．

I agree．Most poets（诗人） describe this season to a feeling of sadness， but in Liu′s eyes autumn is full of life and hope．（　　）

A．excuseB．expressC．expectD．explain