对下列相关模型的叙述正确的是() A . 图1中表示细胞周期,秋水仙素可作用于a、c段能诱导染色体加倍 B . 图2中的温度在a、b时酶分子结构被破坏、活性较低 C . 图3中bc段和de段CO2吸收量减少,C3含量下降 D . 图4中造成cd段下降的原因在有丝分裂和减数分裂中是相同的 答案:D
Paper cutting, ________ traditional folk art form which originated in ancient China, was listed as ________ world cultural heritage by the United Nations in 2002.
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A.the;a
B.a;the
C.the;the
D.a;a