套汇交易是外汇投机的方式之一，具有强烈的投机性（）
参考答案：对
指出下列哪一项为大城市主干路的机动车设计车速( )
A．80km/hB．60km/hC．50km/hD．45km/h
My grandpa sowed the flower seeds in the garden ________ it was the best time for them to grow. [ ]
A. where
B. when
C. that
D. until
