[填空题]These(build) ______ materials may be used for outside walls.

[填空题]These(build)（）materials may be used for outside walls.

[单项选择]

[听力原文]
Mr. Jones: What materials were used for road surfaces during the last century
Engineer: Usually they were gravel and macadam. Tars and asphalt were originally used only as coverings, but later they were used as binders and finally as hot mixtures.
Mr. Jones: Concrete is a modem material as far as road - building goes, isn’ t it
Engineer: Relatively speaking. But you might be surprised to know that a concrete road was built as early as 1893 in Ohio. But it was only 5 miles long. More extensive projects were not undertaken until much later, around 1912 or 1913.
Mr. Jones: This was because of the increase in traffic
Engineer: That’ s right. Especially in the use of heavy tracks. More rigid pavements, such as concrete and brick, became a necessity. For light traffic, though, water-bound macadam, gravel, sand clay, and bituminous mixtures were still used.
Mr. Jones: What are turnpikes usually made of
En
A. Gravel.
B. Asphalt.
C. Macadam.
D. Concrete.

[判断题]All natural materials used for clothing come from animals.

[单项选择]What materials were not used for road surfaces during the last century
A. Gravel.
B. Asphalt.
C. Macadam.
D. Concrete.

[填空题]In the ______ Approach ,teaching materials used often teach the language needed to express and understand different kinds of functions.

[填空题]Children may have access to obscene materials via the Internet and even go astray ____________________ (在媒体的负面影响下)

[填空题]A build up of ethylene gas may results in an explosion.

[单项选择]In ancient time’s people used to build their houses with materials（　）
A. convenient 
B. important 
C. available     
D. natural

[单项选择]The transmission media used t0 build a LAN is (73) .
A. twisted pair
B. microwave
C. optieal fiber
D. satellitic signal

[填空题]build