第17题: [单项选择]You see the lightning ______ it happens, but you hear the thunder later.
A. the instant B. for an instant C. on the instant D. in an instant 参考答案:D 答案解析:in an instant立刻,马上。闪电发生后,你可以马上看到;但是稍后才能听到雷声。
第21题: [单项选择]恶性淋巴瘤较合适的治疗为() A. 激光治疗 B. 化学药物治疗 C. 手术治疗 D. 冷冻治疗 E. 加温治疗 参考答案:B 答案解析:淋巴管瘤的治疗,主要是采用外科手术切除,对范围较大的肿瘤可分期切除。低温或激光治疗对毛细管型淋巴管瘤有一定的效果,但还不够理想。囊性水瘤宜争取早期手术。
A. might have been; had helped B. could have been; helped C. was; could help D. must have been; help 参考答案:B 答案解析:[解析] 本题考查的是虚拟语气的用法,could have been意为“有可能已经……”。例:If I hadn't warned you,you could have been killed。故本