_________（49）A.Her new kitchen cabinets and wall-

_________（49）

A.Her new kitchen cabinets and wall-to-wall carpeting.

B.Because of such leaks,the air in an average home was replaced by fresh outdoor air about once an hour.

C.The level of formaldehyde gas should be controlled.

D.Her throat was constantly dry.

E.says Moschandreas,a pollution scientist at Geomet Technologies in Maryland.

F. Tightly sealed to prevent air leaks,the house was equipped with small double-paned（双层玻璃的）windows and several other energy-saving features.