题目

    BERLIN---A German woman, fearful that a burglar was trying to break into her second -storey apartment, called police after she heard someone climbing up to her balcony shortly after midnight, police said Thursday. Police discovered the “burglar” was a man carrying flowers and a bottle of wine who turned out to be the woman's boyfriend. But then arrested him on an outstanding reason.   “He was trying to surprise her with the flowers and a bottle of wine but it all went wrong,” said Korbach police spokesman Volker Koenig. He said the man jumped down from the balcony and已知全集U={x|x≤4}，集合A={x|2x+4＜0}，B={x|x2+2x-3≤0}，（1）求CUA；（2）求CU（A∩B）。