第22题: [多项选择]中枢系统白血病的防治措施有 A. 造血干细胞移植 B. 大剂量阿糖胞苷 C. 大剂量甲氨蝶呤加四氢叶酸钙解救 D. 鞘内注射化疗药物 E. 颅脑放疗 参考答案:C,D,E 答案解析:中枢系统白血病先做三次鞘注,第1周3次,第2周2次,第3、4周各1次,同时对全身做强化疗,然后做头颅24Gy及脊髓12Gy照射,此后坚持每8周鞘注 1次。
第27题: [单项选择]Rainforests ______ and burned at such a speed that they will disappear from the earth in the near future. A. cut B. are cut C. are being cut D. had been cut 参考答案:C 答案解析:这句话的意思是“雨林正在以那么快的速度被砍伐和烧掉,以至于在不久的将来它们将会消失。”从句子的语境they will disappear from the earth in the near futu