31. Hillary Clinton arrived in Beijing yesterday, ______ the start of her short visit to China. A. marked B. having marked C. marking D. to mark
假如中国一家企业在人民币汇率为100美元=620元人民币时，企业向美国出口商品，每件商品100美元，共卖出4万件商品，获利320万人民币，那么当今年汇率
A、B两地相距400km，甲、乙两车分别从A、B两地同时出发，相向而行，甲车以每小时100km的速度匀速行驶1h后，休息了1h，然后按原速继续行驶到B地，乙
A与B有如下的反应：A+B→C+D （1）若C为厨房内常用的调味品，在A溶液中加入铁粉能产生氢气，则A是 ．若A、B两溶液恰好反应完全，则反应后溶液的pH 7
I was ill that day, otherwise I ____ the sports meet A. would have taken part in B. took part in C. had taken part in D. would take part in
现将10克A和足量B混合加热，A和B发生化学反应，10克A完全反应后生产8克C和4克D，则参加反应的A与B的质量比是 A． 1：1B． 2：1C． 4：1D． 5：1
Millie gave ________ a baby cat yesterday that hurt _________ when it fell from the tree. A. me, itself B. myself, itself C. me, it D.
