这个题是考单词用法.foreseeable要么做定语,如foreseeable difficulty,要么做系语：it is not foreseeable that the fuel will catch fire,用来做表语是不可以的,比如sth is foreseeable,
在这一句,要么说 forseeable weather conditions,要么说 weather conditions that can't be foreseen.
因此选a.
这个题是考单词用法.foreseeable要么做定语,如foreseeable difficulty,要么做系语：it is not foreseeable that the fuel will catch fire,用来做表语是不可以的,比如sth is foreseeable,
在这一句,要么说 forseeable weather conditions,要么说 weather conditions that can't be foreseen.
因此选a.