单项选择题
Saffron returned to London to （） her acting career after four years of modeling.
A．follow B．chase C．seek D．pursue
单项选择题 This video may be freely reproduced （） commercial promotion or sale.
单项选择题 By 2050 the world will have about 2 billion people aged over 60, three times （） today.
单项选择题 He added that the state government has made （） arrangements for the conference.
