28.What did the researchers find in the study?

A.Spiders’motivation to climb.

B.Spiders’sticky liquid on their feet.

C.The secret to spiders’ability to stick

D.The existence of hairs on a spider’s legs.

29.What can we learn from Paragraph 3?

A:The real purpose of the study.

B.The shapes of so-called hairs.

C.The stickiness level of so-called hairs.

D.The link between surface and stickiness.

30.What surprised Schaber?

A.The shape of spatulas

B.The number of tiny hairs.C

C.The direction of tiny hairs.

D.The importance of tiny hairs.

31.What is the significance of the study?

A.It shows us new ways to study animals.

B.It gives humans more creative ideas.

C.It proves humans can climb as spiders.

D.It helps to find a naturally sticky material.