用人单位自用工之日起满（）不与劳动者订立书面劳动合同的，视为双方已订立了无固定期限劳动合同。
A、一月
B、一年
C、两年
D、三年
参考答案：B
In order to speak English better, we ______ be afraid of losing face. Because the most important thing is
to practice. Remember, practice makes perfect. [ ]
A. should
B. shouldn't
C. have to
化学武器的杀伤特点？
