According to the passage, what is one disadvantage of skyscrapers that have mirrored walls
A. The exterior surrounding air is heated.
B. The windows must be cleaned daily.
Construction time is increased.
D. Extra air-conditioning equipment is neede
在聚合酶链反应中使DNA得以扩增的是
A. TaqDNA聚合酶
B. 拓扑异构酶
C. 解链酶
D. 引物酶
女性，50岁，体检发现右乳腺外上象限肿物，直径约1cm，质硬，边界不清，皮肤表面稍有内陷。X线检查可见微小钙化。手术活检切除肿物，最可能的病理诊断是
A. 纤维腺瘤
B. 叶状肿瘤
C. 导管内乳头状瘤
D. 浸润性导管癌
干扰素抗肿瘤作用的机理是
A. 抑制DNA聚合酶
B. 抑制RNA聚合酶
C. 磷酸化蛋白质合成起始因子并使之失活
D. 抑带 DNA复制
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