语法
B
1.The ponderosa pine is _____ of most of the timber used by forest product firms in the Black Hills of South Dakota.
the source
as source
the source which
because the source
2.Computers that once took up entire rooms are now _____ to put on deskTOPs1 and into wristwatches.
small enough
smaller than
so small
as small as
3.According to some educator,the goal of teaching is to help students learn what _____ to know to live a well-adjusted and successful life.
do they need
they need
they are needed
as they may need.
4.The sapphire's transparency to ultraviolet and infrared2 radiation makes _____ in optical instruments.
it is of use
it uses
it a useful
it useful
5._____ initial recognition while still quite young.
Most famous scientists achieved.
That most famous scientists achieved
Most famous scientists who achieved
For most famous scientists to achieve.
6.Mango trees,_____ densely3 covered with glossy4 leaves and bear small fragrant5 flowers,grow rapidly and can attain6 heights of up to 90feet.
whose
which are
are when
which
7._____,the Canadian composer Barbara Pentland wrote four symphonies,three concertos,and an opera,among other works.
An artist who,prolific7
Is a prolific artist
Prolific an artist
A prolific artist
8.The Chisos Mountains in Big Bend National Park in Texas were created by volcanic8 eruptions9 that occurred _____.
the area in which dinosaurs10 roamed
when dinosaurs roamed the area
did dinosaurs roam the area
dinosaurs roaming the area.
9.In bas-relief sculpture,a design projects very slightly from its background,_____ some coins.
as on
because
the way that
similarly.
10.Alaska found the first years of its statehood cosplaytly11 because it had to take over the expense of services _____ previously12 by the federal government.
To provide
Be provided
providing
provided.
11.With age,the mineral content of human bones decreases,_____ them more fragile.
make
and to make
thereby making
which it makes.
12.Not until Kentucky's Mammoth13 Cave had been completely explored in 1972_____.
when was its full extent realizedthat its full extent realized
was its full extent realized
the realization14 of its full extent.
13.The first explorer _____ California by land was Jedediah Strong Smith,a trapper who crossed the southwestern deserts of the United States in 1826.
that he reachedreached
to reach
reaching it
