30．The survivors of the crashed plane had no food or water and were 　　　　the extreme cold weather．

　　　 A．in the possession of　　　　　　　　　　　　　　 B．in the charge of

C．at the mercy of　　　　　　　　　　　　　　　　　　 D．at the risk of

29．　　 　providing humanitarian aid, the UN is also supposed to enforce(实施)agreement．

　　　 A．Apart from　　　　　 B．Rather than　　　　　 C．Far from　　　　　　 D．Except for

28．For fear unemployment, almost one million people sat China’s civil service examination in order to get 　　　　jobs．

　　　 A．proper　　　　　　　　 B．suitable　　　　　　　　 C．generous　　　　　　 D．secure

27．We do our best to be careful and prevent bad things from happening, but most of us will 　　　　

find ourselves in a situation where we or someone else needs help．

　　　 A．personally　　　　　　 B．obviously　　　　　　 C．particularly　　　　　 D．eventually

26．Last November, drivers in North China had to wait for hours to get refueled(加油)because of a sudden gas 　　　　caused by cold weather．

　　　 A．shortage　　　　　　　 B．shortcoming　　　　 C．disadvantage　　　　 D．absence