My father is a teacher. He is always strict _______ his students.
A：to
B：with
C：on
D：in
地球的平均半径是（ ）
科学家发现一种病毒的直径为0.000104米，用科学记数法表示为____米．
-- What's the ______ of this building?
-- It's about 150 metres.
林则徐的“苟利国家生死以，岂因祸福避趋之”这首诗体现的是（ ）
