下图是某地地形剖面示意图，读图完成下列要求。 （1）如果该地区植被遭到破坏，可

汽机正常运行时，真空不低于（）.

语法填空

     One day a rich man took his son on a trip to the country. He wanted to show his son how the poor

lived so he could be thankful __1_ his wealth.

     They spent a couple of days and nights on the farm of   2   would be considered a very poor family.

     On their return the father asked his son   3   (explain) what he had learnt. The boy, who had remained

silent and deep in thought on the journey home,   4  (reply) in a way that shocked his father.

      The boy said he wanted to become a farmer. He envied the farmers who had the beautiful night stars

to give them light   5   his family had only expensive lanterns. His wish was to have a farm    6   he could

go swimming in an endless river instead of the garden pool in their home. Finally he asked his father, "

What makes us safer, large walls around our house   7   friends that will protect us?"

      The boy finished by saying, "   8    the trip I thought we were rich, but today I learnt who is  9  (true)

rich." With this the boy got up and walked away, leaving his father sitting on their comfortable sofa, totally   10    (speech)．

小华在信中说，他转学到外地，那里课本不同、讲话口音不同、老师讲课方法也不同，他很烦恼。为了帮助他，以下建议中你认为不合适的是[ ]

A．尽快熟悉新的学校

B．尽快熟悉新的同学和老师，和他们成为好朋友，向同学学习当地的口音

C．尽快熟悉各科老师的特点和教学方法

D．让父母把他转回原地上学

路南石林景观形成的主要外力作用是（）

A、流水堆积

B、流水侵蚀

C、风力堆积

D、风气侵蚀

空调系统在除烟时，设备冷却系统则（）

A.供气停止，排气进行

B.供气进行，排气停止

C.供气停止，排气停止

D.供气进行，排气进行