There________ an eraser in the pencil box.
A: is
B: are
A: is
B: are
举一反三
- A country produces only pencils and erasers. Pencil production is allocatively efficient if the marginal ________ of a pencil equals the marginal ________ of ________. A: cost; benefit; an eraser B: cost; cost; an eraser C: benefit; benefit; an eraser D: benefit; cost; a pencil
- Weshouldtakepaper,__pencil,__eraser,__andknife.__此句话的语调顺序应为
- The box is empty.____________ nothing in the box.
- In the flow chart, it is ( ) that represents the judgment box. A: Rectangular box B: Diamond box C: Parallelogram box D: Oval box
- The core promoters of prokaryotes are - 35 box and - 10 Box.