氨基酸的跨膜转运A.单纯扩散 B.易化扩散 C.出胞作用 D.原发性主动转

A．No-smoking, double bed and quiet.

B．No-smoking, single bed and quiet.

C．Smoking, single bed and quiet.

D．Smoking, double bed and quiet.

What gives people who buy on credit more pleasure？

A．The cheapest price of the things they buy.

B．The great amount of money they spend.

C．The things they buy.

D．The good quality of the things they buy.

Which single item in Mr. West's order is the cheapest？

A．A box of pens

B．A box of pencils

C．A set of stationery

D．A box of staples

A．single

B．double

C．suite

D．twin

A、the lowest amount or cheapest price the buyer and the seller will accept in the deal

B、a detailed list or printout

C、increasing and decreasing amounts

D、the proposals

Which statement is NOT true about VOIP？

A．It is the cheapest way of world-wide communication.

B．It is a good way to build strong relations.

C．It has the same quality as the traditional telephone service.

D．It uses a single network to transfer voice and data.

A.makes up

B.consists of

C.lays out

D.serves as

ackets. The shopping center will sell new devices at a heavily _______ price to consumers who are sensitive to price in return for their commitment to long-term contracts with a single retailer. (subsidize)