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Elephants are perhaps the only animals that are hunted for their teeth. Elephant tusks, or very large teeth growing on either side of their mouths, are composed of a valuable material called ivory(象牙). (78) An elephant uses its long, pointed tusks as tools for digging in the ground for food. He also uses them as weapons in combat. The tusks of male elephants are usually large and heavy. In Africa, female elephants have long, light tusks. In India and other parts of southern Asia, female elephants have small, short tusks or none at all. (79) Tusks in good condition are in great demand, and may sell for as high as two thousand dollars or more. Because of this, large numbers of elephants have been killed. Some countries have initiated (开始) methods to protect elephants. They have established elephant preserves, areas of land set aside for herds of elephants where no one is allowed to harm them. Elephants on the preserves are safe from ivory hunters. Female elephants in India and southern Asia have ______ .
A.
large and heavy tusks
B.
small, short tusks or none at all
C.
small and heavy tusks
D.
long, light tusks
题目标签：象牙
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【单选题】Elephants are perhaps the only animals that are hunted for their teeth. Elephant tusks, or very large teeth growing on either side of their mouths, are composed of a valuable material called ivory(象牙)...
A.
large and heavy tusks
B.
small, short tusks or none at all
C.
small and heavy tusks
D.
long, light tusks
【单选题】2021年3月20日，“考古中国”重大项目工作进展会通报，三星堆遗址考古新发现6座“祭祀坑”，现已出土金面具残片、巨青铜面具、青铜神树象牙等重要文物500余件。据介绍，三星堆遗址是四川盆地目前发现（）时期规模最大、等级最高的中心性遗址。
A.
东周
B.
西周
C.
春秋战国
D.
夏商
【单选题】1960—1970年间，非洲国家津巴库的象牙偷猎者杀了6500多头大象。同期，津巴库的大象总数从大约35000头下降到不到30000头。1970年，津巴库实行了新的反偷猎措施。1970—1980年间，有800多名偷猎者被捕或被驱逐出境。但到1980年，津巴库的大象总数下降到约21000头。 以下答案若均属实，哪一个最有助于解释以上矛盾
A.
1970—1980年间在津巴库被捕的偷猎者很少被处以长期徒刑。
B.
由于广泛开展的反对屠杀大象的公众运动，1970—1980年间象牙需求量下降了。
C.
1970—1980年间，邻国孟巴萨的大象总数有小幅上升。
D.
1970年以前，津巴库议会通过的反偷猎法很少得到实施。
E.
1970—1980年间，津巴库的几千亩森林——大象的自然栖息地被夷为农田。
【单选题】一项研究显示，数十年盗猎大象的活动在某种程度上已经改变了非洲象进化方向，天生没有象牙的雌象越来越多。研究人员认为这一现象说明人类活动对生物进化的影响之大，甚至能够“改变动物身体构造”。以下哪项为真，则最能削弱上述结论：
A.
雌象的象牙质地较雄象的象牙细腻，是盗猎者的主要目标
B.
大象的体型巨大，即便是食物链顶端的狮子也不敢猎食大象
C.
数十年间，盗猎非洲象牙的活动从未停止过
D.
无论哪里的大象，总有一部分雌象原本就是不长象牙的
【单选题】Passage Four Elephants don’t forget—at least, female elephants don’t. Elephant families are matriarchal. And the social knowledge gained by the oldest females is the key to a family grou...
A.
run into other elephant families
B.
give wrong warnings to their mothers
C.
run away on hearing a strange sound
D.
produce more babies by gathering together often
【单选题】美国P&G公司的产品包括：象牙肥皂、海飞丝洗发水、飘柔洗发水、玉兰油等，其采用的商标策略是（）
A.
个别品牌
B.
品牌延伸策略
C.
多重品牌策略
D.
家族品牌策略
【单选题】Passage Four Elephants don’t forget—at least, female elephants don’t. Elephant families are matriarchal. And the social knowledge gained by the oldest females is the key to a family grou...
A.
the stronger she will be
B.
the poorer memory she will have
C.
the more useless her tusks will be
D.
the more likely she will be killed
【单选题】人造象牙中，主要成分是 ，它是通过加聚反应制得的，则合成此高聚物的单体是______
A.
B.
A．(CH 3 ) 2 O
C.
B．HCHO
D.
C．CH 3 CHO
E.
D． 
【单选题】Passage Four Elephants don’t forget—at least, female elephants don’t. Elephant families are matriarchal. And the social knowledge gained by the oldest females is the key to a family grou...
A.
how fast elephants form into groups
B.
how important the age of a leading elephant is
C.
how frightened elephants are when hearing a strange call
D.
how frequently old elephants call other members of the family
相关题目：
【单选题】Elephants are perhaps the only animals that are hunted for their teeth. Elephant tusks, or very large teeth growing on either side of their mouths, are composed of a valuable material called ivory(象牙)...
A.
large and heavy tusks
B.
small, short tusks or none at all
C.
small and heavy tusks
D.
long, light tusks
【单选题】2021年3月20日，“考古中国”重大项目工作进展会通报，三星堆遗址考古新发现6座“祭祀坑”，现已出土金面具残片、巨青铜面具、青铜神树象牙等重要文物500余件。据介绍，三星堆遗址是四川盆地目前发现（）时期规模最大、等级最高的中心性遗址。
A.
东周
B.
西周
C.
春秋战国
D.
夏商
【单选题】1960—1970年间，非洲国家津巴库的象牙偷猎者杀了6500多头大象。同期，津巴库的大象总数从大约35000头下降到不到30000头。1970年，津巴库实行了新的反偷猎措施。1970—1980年间，有800多名偷猎者被捕或被驱逐出境。但到1980年，津巴库的大象总数下降到约21000头。 以下答案若均属实，哪一个最有助于解释以上矛盾
A.
1970—1980年间在津巴库被捕的偷猎者很少被处以长期徒刑。
B.
由于广泛开展的反对屠杀大象的公众运动，1970—1980年间象牙需求量下降了。
C.
1970—1980年间，邻国孟巴萨的大象总数有小幅上升。
D.
1970年以前，津巴库议会通过的反偷猎法很少得到实施。
E.
1970—1980年间，津巴库的几千亩森林——大象的自然栖息地被夷为农田。
【单选题】一项研究显示，数十年盗猎大象的活动在某种程度上已经改变了非洲象进化方向，天生没有象牙的雌象越来越多。研究人员认为这一现象说明人类活动对生物进化的影响之大，甚至能够“改变动物身体构造”。以下哪项为真，则最能削弱上述结论：
A.
雌象的象牙质地较雄象的象牙细腻，是盗猎者的主要目标
B.
大象的体型巨大，即便是食物链顶端的狮子也不敢猎食大象
C.
数十年间，盗猎非洲象牙的活动从未停止过
D.
无论哪里的大象，总有一部分雌象原本就是不长象牙的
【单选题】Passage Four Elephants don’t forget—at least, female elephants don’t. Elephant families are matriarchal. And the social knowledge gained by the oldest females is the key to a family grou...
A.
run into other elephant families
B.
give wrong warnings to their mothers
C.
run away on hearing a strange sound
D.
produce more babies by gathering together often
【单选题】美国P&G公司的产品包括：象牙肥皂、海飞丝洗发水、飘柔洗发水、玉兰油等，其采用的商标策略是（）
A.
个别品牌
B.
品牌延伸策略
C.
多重品牌策略
D.
家族品牌策略
【单选题】Passage Four Elephants don’t forget—at least, female elephants don’t. Elephant families are matriarchal. And the social knowledge gained by the oldest females is the key to a family grou...
A.
the stronger she will be
B.
the poorer memory she will have
C.
the more useless her tusks will be
D.
the more likely she will be killed
【单选题】人造象牙中，主要成分是 ，它是通过加聚反应制得的，则合成此高聚物的单体是______
A.
B.
A．(CH 3 ) 2 O
C.
B．HCHO
D.
C．CH 3 CHO
E.
D．
【单选题】Passage Four Elephants don’t forget—at least, female elephants don’t. Elephant families are matriarchal. And the social knowledge gained by the oldest females is the key to a family grou...
A.
how fast elephants form into groups
B.
how important the age of a leading elephant is
C.
how frightened elephants are when hearing a strange call
D.
how frequently old elephants call other members of the family
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