【单选题】The students were summoned _______ to be interviewed. A. by turns B. in return C. in turn D. in honor
【单选题】I don’t like the black jumper, but the ______is nice.
【多选题】用于预防婴儿由于维生素D缺乏所致佝偻病的措施有( )。
【单选题】1644年十月初一,第一位正式宣告定都燕京(今北京)的帝王是( )。
【简答题】针对加工中心的工艺特点,加工中心适宜的加工对象有哪些?
【单选题】A clock must _____ keeps good time. [ ]