The great storms that hit the coast start【6】innocent circling disturbances hundreds, even thousands of miles out to sea. As they travel aimlessly over water【7】by the summer sun, they are carried westward by the【8】winds. When conditions are just【9】, warm, moist air flows in【10】the bottom of such a disturbance, moves upward through it and comes out at the top. In the【11】, the moisture in this warm air produces rain, and with it the heat is converted to energy in the form. of strong winds. As the heat increases, the【12】hurricane begins to swirl in a counter-clockwise motion.
The average life of a hurricane is only about nine days, but it contains almost【13】power than we can imagine. The energy in the heat released by a hurricane's rainfall in a(n)【14】day would【15】the entire electrical needs of the United States for more than six months. Water, not wind, is the main【16】of death and destruction in a hurricane. A(n)【17】hurricane brings 6- to 12-inch downpours【18】in sudden floods.【19】is the powerful movement of the sea—the mountains of water moving toward the low-pressure hurricane center. The water level【20】as much as 15 feet above normal as it moves toward shore.
(1)
A.they
B.these
C.it
D.this
第2题
A.A.Discovery message
B.B.Session message
C.C.Advertisement message
D.D.Notification message
第3题
A.Advertisement:发送hello消息,用于建立LDP会话连接
B.Discovery:用于通告和维护网络中LSR的存在
C.Session:用于建立,维护和结束LDP对等实体之间的会话连接
D.Notification:用于提供消息通告和差错通知
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