A They send the ivory to multiple ports before its final destination B They use historically secure smuggling routes for shipment. C They hide the ivory in innocent-looking shipments of other goods D They ship two tusks from one elephant separately.

A It aims to catch the smaller suppliers in smuggling B It has been used by wildlife authorities in Africa. C It can clone ivory to meet more demands. D it can help identify the ivory and the cartel.

A It is time-consuming. B It is challenging C It is money-consuming. D It is useless.

A DNA test has become a key technology in biology. B Internal trade on ivory has been stopped. C Bans on ivory sales has been issued in many countries. D Poaching elephant has decreased in Africa

A 只有(2)和(4) B 只有(1) C 只有(1)和(4) D 全部是错误的

A 目前，世界范围内的红豆杉已经濒临灭绝 B 从世界范围看，我国拥有将近一半的红豆杉储量 C 我国南北方都有红豆杉资源的分布，南方比北方更多 D 紫杉醇这种物质导致了红豆杉大面积的死亡

A 抑制微管蛋白解聚一肿瘤细胞凋亡—阻滞细胞周期 B 阻滞细胞周期—抑制微管蛋白解聚一肿瘤细胞凋亡 C 抑制微管蛋白解聚—阻滞细胞周期—癌细胞凋亡 D 抑制微管蛋白解聚—阻滞细胞周期—细胞凋亡

A 2 B 3 C 1 D 4

A 红豆杉的存量少，生存条件苛刻，难以人工培育 B 野生红豆杉资源濒临枯竭，国家已经禁止砍伐 C 市场对红豆杉中的紫杉醇需求量大，而且紫杉醇的单价高 D 从红豆杉中提取的紫杉醇能够治疗多种癌症

A 特定范围1—4月份累计贸易的最大值 B 特定地区以及特定地区内的国家 C 这些地区或国家期限内相应数值发生异动 D 表示包含关系，例如东盟属于亚洲，美国属于北美洲