流行性腮腺炎急性期无需隔离，可以正常上课、学习。
参考答案：错
The manager has to go on a business trip.His company will be left in________of his secretary. [ ]
A. charge
B. the charge
C. need
D. place
鸟卵胚胎发育所需的营养物质主要来自（ ）
A．卵壳
B．卵白
C．卵黄
D．胚盘
