第5题: [单项选择]The recent conference on the effective use of the seas and oceans was another attempt resolving major differences among countries with conflicting interests. A. resolve B. resolves C. to resolve D. being resolved 参考答案:C 答案解析:习惯搭配。attempt to do sth尝试,试图,努力:They attempt to climb the steepest part of the mountain.他们努力攀登这座山的最陡的
第7题: [单项选择]支气管哮喘的发病与下列哪种物质无关 A. 环化一磷酸腺苷(cAMP) B. 环化一磷酸鸟苷(cGMP) C. 腺苷脱氨酶(ADA) D. 慢反应物质(SKS-A) E. 前列环素(PGI2) 参考答案:C 答案解析:[解释] cAMP/cGMP,比值增加、支气管舒张;比值减小可引起气道收缩,诱发支气管哮喘。SKS-A增加亦可使气道收缩;PGI2增加可使气道扩张。只有腺苷脱氨酶(ADA)与支气