【名词&注释】
相对原子质量(relative atomic mass)、遗传物质(genetic material)、裸子植物(gymnosperm)、认识水平(cognitive level)、人类生存环境(human living environment)、直接关系(directly related)、双子叶植物(dicotyledon)、核外电子(extranuclear electron)、环境保护意识(environmental awareness)、从左到右(from left to right)
[单选题]唇形科植物含挥发性芳香油，这是它们多为香料植物又为药用植物的原因。( )
A. 正确
B. 错误
查看答案&解析
举一反三：
[单选题]在国际社会中，任何国家都不得以任何方式强迫他国接受自己的意志，各国在外交文件上有使用本国文字的权利。这体现了主权国家在国际社会中享有
A. 独立权
B. 平等权
C. 自卫权
D. 管辖权
[单选题]某元素只存在两种天然同位素，且在自然界它们的含量相近，其相对原子质量为152.0，原子核外的电子数为63。下列叙述中错误的是
A. 它是副族元素 B．它是第六周期元素
B. 它的原子核内有63个质子
C. 它的一种同位素的核内有89个中子
[单选题]甲型N1H1流感病毒能在宿主细胞内繁殖，其主要原因是该病毒
A. 基因组变异过快
B. 基因复制和表达过程过于简单
C. 基因和蛋白质的结构与宿主的相似性很高
D. 利用宿主细胞的酶完成基因复制和表达
[单选题]双子叶植物(dicotyledon)茎内的次生木质部由( )分裂、生长和分化而成。
A. 束中形成层细胞
B. 束间形成层细胞
C. 纺锤状原始细胞
D. 射线原始细胞
[单选题]DCities alarmed by deaths and injuries of pedestrians are taking efforts to make crosswalks safer for people on foot, especially seniors and children who need more time to cross streets.
A. A pedestrian is killed in a traffic accident in the USA every 110 minutes；one is injured every nine minutes, according to official date. Crosswalk can be especially dangerous for the elderly. Among people 70 and older, 36% of pedestrian deaths in 2006 occurred in crosswalks, compared with 21% of those younger than 70 , according to the Insurance Institute for Highway Safety.
B. The Federal Highway Administration（FHWA）advises that next year states increase by nearly 15% the amount of time traffic lights provide for pedestrians to cross the street after the flashing orange hand appears .
C. FHWA spokesman Doug Hecox says reasons for the change include an aging population that needs more time to cross, health-conscious Americans walking more, children encouraged to walk to prevent getting overweight and high gas prices pushing people to walk instead of drive.
D. says.
E. 53. Which of the following is true according to the text?
F. Among 100 pedestrian deaths there were 21 people younger than 70.
G. Old people are more likely to meet with accidents in crosswalks.
H. Traffic accidents killed more old people than young people.
I. About seven traffic accidents happened per hour.
[单选题]
A. split
B. spend
C. spare
D. save
[单选题]Which of he tollowing can best describe Andy’s escape from the becs?
A. No pain no gains.
B. Once bitten, twice she
C. Where there is a will, there is a way.
D. In time of dangct, one’s mind works fast.
[单选题]根据原文所提供的信息，下列推断正确的一项是( )
A. 人与生物圈计划是人类生存环境不断恶化和资源日益匮乏的产物。
B. 人与生物圈计划标志着人类的科技水平已经达到了相当的高度。
C. 人与生物圈计划将提高人类的环境保护意识(environmental awareness)，让人们自觉地为环境保护做出贡献。
D. 人与生物圈计划将揭开大自然更多的秘密，为全球的可持续发展提供参考。
[单选题]裸子植物的胚乳是( )。
A. 孢子体世代，核相为3N
B. 配子体世代，核相为3N
C. 孢子体世代，核相为2N
D. 配子体世代，核相为N
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