The price of eggs in a small town yesterday is ￥30 per dozen, and its quantity supplied is 8 dozens. But the price rise to ￥50 per dozen, and the quantity supplied is also rise to 12 dozens per day. Please calculate the elasticity of supply about eggs in the town.

We already have ________________ pencils, but we need two _________________ pens. A: dozens of, dozen of B: dozens of, dozens C: dozen of, dozen D: dozens of, dozen

I bought three （） eggs. A: dozen B: dozens C: dozen of D: dozens of

Shortly after the accident, two__________ policemen came to the spot. A: dozen of B: dozens C: dozen D: dozens of

I want ____ pencils, please. A: two of dozen B: two dozen C: two dozens D: two dozens of

I want ________ pencils, please! A: three of dozen B: three dozen C: three dozens D: three dozens of

-- There are ______ such books here.[br][/br] -- I only need ______ these books on this shelf. A: eight dozens ; one dozen B: eight dozens of ; one dozen of C: eight dozen ; one dozen D: dozens of ; one dozen of

Shortly after the accident, two ______ policemen came to the spot. A: dozen of B: B. dozens C: dozen D: D. dozens of

Low-paying jobs are _______ but it’s hard to find a good one.( ) A: dimes and dozens B: a dime and dozen C: a dime a dozen D: a dime and dozens

Mr. Smith _______ me to buy several _______ eggs for the dinner. A: asked; dozen B: suggested; dozens of C: had; dozen D: persuaded; dozens