______ his timely help, Kate overcame the hardship at last.                                                                                                                                                                                                                                                                                                                                                                                                                         

A．Now that

B．Thanks to

C．Since

D．Because

气候变化应对的科技支撑重点任务指出，为在气候变化与（）谈判中处于主动地位，组织国内跨部门、跨学科的研究与业务队伍，开展气候变化的科学和国际外交对策研究。

A.全球环境

B.环境外交

C.国际外交

D.环境保护