Potato chips were really invented by accident. The popular food was invented in 1853 by George Crum, who was a cook at Moon Lake Restaurant in Saratoga Springs，New York. A guest complained that the fried potatoes that Crum had cooked were too thick. Crum thought the guest was making trouble. In return，he cut potatoes paper thin and fried them. The guest loved what soon became known as “Saratoga Chips”， and the new dish became the most popular in the restaurant. Other restaurants in the eastern United States borrowed the idea，but potato chips were not produced for home use until William Tappenden of Cleveland，Ohio started the first potato chip factory in Cleveland，which made lots of money for him.
Potatoes are made up of about 25% solids (固体)，mostly starches (淀粉) and sugar，and 75% water. Marsha McNcil Sherman，Director of Fast Food Association in Los Angeles，explains，“Frying is a way to dry the potato. More of the water can be found in the middle of the potato .So，the edges (边) of potatoes are fried faster than the middle.”
【小题1】What's the Chinese meaning of the underlined word “complain”？

A．表扬

B．鼓励

C．自责

D．抱怨

【小题2】What do you think of William Tappenden?

A．Outgoing.

B．Clever.

C．Brave.

D．Hardworking.

【小题3】What are potatoes mainly made up of?

A．Water.

B．Starches.

C．Sugar.

D．Oil.

【小题4】What does the passage mainly tell us?

A．Why potato chips are so popular.

B．How to make potato chips.

C．How potato chips were invented and what potatoes are made up of.

D．The edges of potatoes are fried faster than the middle.