世界上第三个发射载人航天飞船的国家是：[ ]
A．俄罗斯
B．美国
C．中国
D．英国
答案：C
产品验证中所指的“客观证据”是( )。
A．产品说明
B．产品质量检验记录
C．技术标准
D．产品供方的发货单
Don't worry! I who _____ your best friend will do as far as I can to help you. [ ]
A. is
B. am
C. were
D. was
