当车祸发生时，保安员要迅速到达现场，并在出事在车辆后10米处，亮起危险警戒线。
参考答案：错
So hard-working _____ that he sets a good example to all the other classmates. [ ]
A. he is
B. is he
C. does he
D. he does
井冈蜜柚冬季于根颈部位高培土防冻效果良好，但需在（）及时扒开培土。
