第16题: [单项选择]激素类抗肿瘤药物是()。 A. 阿霉素 B. 甲氨蝶呤 C. 博来霉素 D. 丙酸睾酮 E. 达卡巴嗪 参考答案:D
第17题: [单项选择]It is extremely urgent that they ______ from the mountain before dark. A. must be rescued B. should rescue C. can be rescued D. be rescued 参考答案:D 答案解析:在句型“n/it is urgent/necessary/important+从句”中,从句中要用虚拟语气,其构成是:should do,可以将should省略。