Without the earth’s atmosphere to protect them, astronauts can be exposed to int

题干

Without the earth’s atmosphere to protect them, astronauts can be exposed to intense radiation from the sun, ____ them at risk of cancer.

A．to leave

B．leaving

C．having left

D．left

上一题下一题 0.64难度单项选择更新时间:2013-12-02 02:47:49

小学学科试题库

初中学科试题库

高中学科试题库