单选题
Text
... Fossil fuels burned to (8) cars and trucks, (9) homes and businesses, and power factories are (10) for about 98% of US carbon dioxide emissions, 24% of methane emissions, and 18% of nitrous oxide emissions. Increased agriculture, deforestation, (11) , industrial production, and mining also contribute a significant (12) of emissions. In 1997, the United States (13) about one-fifth of total global greenhouse gases.
The 20th century' s 10 warmest years all (14) in the last 15 years of the century. Of these, 1998 was the warmest year on (15) . The snow (16) in the Northern Hemisphere and floating ice in the Arctic Ocean have decreased. Globally, sea level has (17) 4～8 inches over the past century. Worldwide precipitation over land has increased by about one percent. The (18) of extreme rainfall events has increased throughout much of the United States.
Increasing concentrations of greenhouse gases are likely to (19) the rate of climate change. Scientists expect that the average global surface temperature could rise 1～4.5
(0.6～2.5℃) in the next fifty years, and 2.2～10
... Fossil fuels burned to (8) cars and trucks, (9) homes and businesses, and power factories are (10) for about 98% of US carbon dioxide emissions, 24% of methane emissions, and 18% of nitrous oxide emissions. Increased agriculture, deforestation, (11) , industrial production, and mining also contribute a significant (12) of emissions. In 1997, the United States (13) about one-fifth of total global greenhouse gases.
The 20th century' s 10 warmest years all (14) in the last 15 years of the century. Of these, 1998 was the warmest year on (15) . The snow (16) in the Northern Hemisphere and floating ice in the Arctic Ocean have decreased. Globally, sea level has (17) 4～8 inches over the past century. Worldwide precipitation over land has increased by about one percent. The (18) of extreme rainfall events has increased throughout much of the United States.
Increasing concentrations of greenhouse gases are likely to (19) the rate of climate change. Scientists expect that the average global surface temperature could rise 1～4.5
(0.6～2.5℃) in the next fifty years, and 2.2～10
单选题
A. drive B. operate C. run D. motivate
【正确答案】
C
【答案解析】[解析] 本题考查近义动词辨析。drive驾驶，驱赶；operate操作，运行；run启动，跑；motivate受驱使，激发(兴趣，潜力)。故选C。
单选题
A. heated B. heighten C. lighten D. heat
【正确答案】
D
【答案解析】[解析] 本题考查动词词义辨析。lighten使…变轻；heighten使…变高；heat加热，加温。根据句意，“为家庭和公司供暖”，故选D。
单选题
A. occupied B. taken C. responsible D. dispensable
【正确答案】
C
【答案解析】[解析] 本题考查固定搭配be responsible for(负责，管理)；taken for granted自以为是；dispensable不必要的，不必须的。故选C。
单选题
A. landing B. landfills C. landscape D. landings
【正确答案】
B
【答案解析】[解析] 本题考查名词词义辨析。根据文中空前内容“deforestation...industrial production，此空应和其属同类词语。landing着陆，着地；landscape风景，景色；landfills垃圾掩埋，故选B。
单选题
A. piece B. part C. share D. component
【正确答案】
C
【答案解析】[解析] 本题考查近义名词用法。piece片；part部分；share一份，所占的部分；component组成部分。根据句意，选C。
单选题
A. charged B. sent off C. give out D. emitted
【正确答案】
D
【答案解析】[解析] 本题考查动词及词组意义辨析。charge收费，告状；send off寄出，发出；give out用完，消耗；emit排放(气体等)，discharge，send out，give off意同emit，故选D。
单选题
A. incurred B. occurred C. incured D. occured
【正确答案】
B
【答案解析】[解析] 本题考查动词辨析及其过去式形态。incur带来，引起，过去式为incurred；occur发生，过去式为occurred，双写“r”，故选B。
单选题
A. note B. line C. record D. time
【正确答案】
C
【答案解析】[解析] 此题考查短语on record(有记录的，有记载的)。note笔记，无on note用法；on line(网上)在线；on time及时，准时。故选C。
单选题
A. hides B. buries C. occupied D. covers
【正确答案】
D
【答案解析】[解析] 此题考查句子成分的划分，本句的主语应是the snow covers和floating ice，故此处的covers应是名词而不是动词；bury为动词，意为“埋下，埋葬”；occupy为动词意为“占据，占领”；hide虽有名词意义，但意为“兽皮，皮革”，显然与题意不符。故选D。
单选题
A. risen B. increased C. raised D. arose
【正确答案】
A
【答案解析】[解析] 本题考查近义动词辨析。rise提高，上升；过去分词risen；increase增加；raise哺养，筹集；arise升起。故选A。
单选题
A. rate B. ratio C. tendency D. frequency
【正确答案】
D
【答案解析】[解析] 本题考查名词辨析。rate比率；ratio比率；tendency趋势，走势；frequency频率，故选D。
单选题
A. accelerating B. accelerate C. accelerated D. accelerates
【正确答案】
B
【答案解析】[解析] 本题考查be likely to的用法，其后加动词原形，故选B。
单选题
A. being B. with C. in D. to
【正确答案】
B
【答案解析】[解析] 本题考查介词短语做状语用法。根据句意，应选B。
单选题
A. as B. while C. when D. as if
【正确答案】
A
【答案解析】[解析] 本题考查连词用法。根据题意，前后两句之间是因果关系，故选A。
单选题
A. that B. who C. what D. which
【正确答案】
D
【答案解析】[解析] 本题考查非限定性定语从句用法。只能由先行词which引导，故选D。
单选题
A. intensive B. intense C. extensive D. tense
【正确答案】
B
【答案解析】[解析] 本题考查形容词辨析，intensive精深的，密集的；extensive广泛的，多面的；intense强烈的，猛烈的；tense时态，故选B。
单选题
A. Guess B. Evaluations C. Calcultations D. Conclusions
【正确答案】
C
【答案解析】[解析] 本题考查名词词义辨析。guess猜测，猜想；evaluation评估，评价；calculation推算，估计；conclusion总结结论。故选C。
单选题
A. local B. peculiar C. global D. general
【正确答案】
C
【答案解析】[解析] 本题考查形容词词义辨析。local地方的，当地的；peculiar特殊的，古怪的；global全球的，整体的；general广泛的，大体的。故选C。
单选题
A. whether B. which C. weather D. what
【正确答案】
A
【答案解析】[解析] 本题考查宾语从句先行词用法。be+表否定、怀疑的形容词，接从句时常由whether、if引导。故选A。
单选题
A. diversifying B. various C. variable D. changeless
【正确答案】
C
【答案解析】[解析] 本题考查形容词词义辨析。diversify使…多样化，不一样；various各种各样的；多样的；variable变化的，易变的；changeless不变的，故选C。