иԇZxԇ}
1. While play is important at all levels of human development _________ takes on particular significance when children are five and six years old.
A. it
B. and
C. which
D. because it
𰸣A
ȱZit @ʽZ
gģِӴ˵İlչҪģǮС56qĕrxش
2. During the second and third years of life children gain _________ over their bodies.
A. control increasing
B. increasing to control
C. control is increasing
D. increasing control
𰸣D
ȱeZґԓ adj.~ֻxD.
gģLĵڶСԼwˡ
3. All brass instruments use a mouthpiece _________ into a long cone-shaped tube.
A. is inserted
B. that inserted
C. that is inserted
D. and inserted
𰸣C
thatһZľmouthpiece~A Fɂ^Z~e;BDԓñ;
gģе~ܘһLFͲιĴ
4. By the mid-twentieth century United States presidential staffs _________ had numbered fewer than ten a century earlier numbered in the hundreds.
A. as
B. that they
C. which
D. and
𰸣C
ԶZľ䣬ֻwhichԶZľ
gģ20rgĿyنT_ˎװقһoǰ߀ָɔ
5. In 1966 only 60 percent of all five year olds in the United States attended kindergarten _________ in 1985 almost 82 percent did so.
A. with
B. which
C. whether
D. while
𰸣D
гF˃ɂ^ZȱB~
gģ1966꣬5qСֻ60%ą׃@198582%С׃@ˡ
6. By 1920 the area of the United States under cultivation had more than doubled in just 50 years and the national population that surpassed 100 million.
B
cɶZľs`öZľB~thatȥͺ
gģ1920_50ѽ˃ɱȫ˿Ҳ^100f
7. Some areas of the deep sea are vulnerable frequent natural disturbances taking the form of intense currents mud slumps low oxygen and upwellings.
𰸣A
c~e`ijfrequently vulnerable natural disturbances
gģһЩطܵȻɔ_@Щɔ_Լ{ʽ
pumpkina䣺 Ǹijvulnerable to frequent natural disturbances
8. In the United States the first roads were paved in colonial times first with logs latest with cobblestones or brick depending on the region.
𰸣B
c~ԻʾȺĠBrlater
gģ·ֳؕr䁵ġһ_ʼľ^ͬZʯuK
9. In physics sound is considered to be the waves of vibratory motion nether or not they are heard by the human ear.
𰸣C
cB~ʹñ_e`ijwhether or not
gģJ\ӰlIJ˶ܲ Ҋ
10. Over one thousand mineral are known most of which are characterized by definite chemical composition crystalline structure and physical properties.
𰸣B
cɔ~Ώ͔`ijminerals
gģг^1ǧNV|֪кܶͨ^_ĻWMɣYYԱF
11. The layers of an elephant's tusk are deposited from the pulp yet that the innermost layer is the newest.
𰸣C
cB~`ijsoso thatһ
gģLķǏ|_ʼeһµġ
12. Butane is found into both oil and natural gas.
𰸣B
c~`ijin
gģwǏʯͺȻҵ
13. When expelled from the nucleus of an atom a neutron is unstable and decay to form a proton and an electron.
𰸣C
c^ZrB`ijdecays
gģӏԭӺаlĕrDzģ˥ˏĶγһ|Ӻһ
Pumpkina䣺 Ğdecayingܸm unstable һ~is