单选题：根据下面内容，回答题：Los Angeles has planted 2,000 rubber trees down t

根据下面内容，回答题：
Los Angeles has planted 2,000 rubber trees down the middle of one of its main streets. Thesetrees do not 21 rubber. They are,22,made of rubber. Mr. Joe Dynamo, a spokesman for LosAngeles 23 council, explained the reasons. He said:
"These 24 are representative of our virtual society. We have polystyrene grass on our golf olf 25. We have non-milk powder 26 our coffee. We 27 copies in plastic of old woodenfurniture. We have fiberglass tombstones.28 shouldn't we have trees made of rubber?"
"At 50 miles an hour,29 motorist will see any difference. And our preservation 30 willbe lower. You give the trees an annual rinse (清洗) with detergent, and 31 them off twice a year.We 32 a lot of money because transplanting, pruning, weeding and leaf-collection are all33. And we have a 60-year 34 guarantee on each plant. This is rationalization at 35
best. "
第21题应选( ) A．invent
B．do
C．produce
D．create