劳动关系当事人是否遵循法律规范和()是劳动争议产生的直接原因。
A.劳动关系
B.劳动合同
C.劳动法律
D.合同规范
参考答案：D
根据句意，用括号内所给单词的适当形式填空。
1. At her birthday party, several ________(basket) of fruit were eaten.
2. The price of coffee has _________(rise) by ten cents.
3. The room is full of ________(wood) furniture (家具).
4. Chicago _________(develop) into a big city in the late 1800s.
5. Dad was so tired that he fell asleep while ________(read) the newspaper.
一个消防员呼救器后场接收装置可以接收（）个及以上数量的呼救器发射出的各种工作状态的无线电信号
A.1
B.2
C.4
D.8
