菌根中不仅菌根菌对植物有利，而且植物对菌根也有利，因为这是一种共生关系。（）
参考答案：对
Most Chinese children like to sleep with their mother. They are ＿＿ the dark.
A．interested in
B．afraid
C．terrified of
D．sure of
油管损坏密封、密封失效、接头松动引起的泄漏,导致系统供油量不足。
