下列城市中，有“国际经济、贸易中心”之称的是（   ）

已知关于x的不等式（x﹣1）（x﹣2a）＞0（a∈R）的解集为A，集合B=（2，3）．若B⊆A，则a的取值范围为____．

钢铁腐蚀在生活和生产中相当普遍。下列措施能防止钢铁腐蚀的是（    ）

Why should we elect him _________mayor? I mean last year he was elected as _________ member of the Congress and he has failed to keep any promise he made during the election.

以下估测与实际情况相符的是