Question

【題目】閱讀理解。
Tornadoes are nature's most violent storms, which can cause deaths and destroy a neighborhood in seconds. A tornado appears as a funnel-shaped (漏斗狀) cloud from a thunderstorm to the ground with whirling (飛快移動(dòng)) winds that can reach 300 miles per hour. Damage paths can be over one mile wide and 50 miles long. Every state is at some risk from this disaster.
Some tornadoes can be seen clearly, while rain or nearby low-hanging clouds obscure others. At many times, tornadoes develop so rapidly that little, if any, advance warning is possible.
Before a tornado hits, the air may become very still. A cloud of debris (散片) can mark the location of a tornado even if a funnel can not be seen. Tornadoes generally occur near the edge of a thunderstorm, when the strong wind may die down. It is not uncommon to see clear, sunlit skies behind a tornado.
The following are facts about tornadoes:
The average forward speed of a tornado is 30 MPH, but may also vary from still to 70 MPH. Debris is picked up or a cloud forms in the funnel.
The average tornado moves from southwest to northeast, but tornadoes have been known to move in any direction. Tornadoes are most often reported east of the Rocky Mountains during spring and summer months.
Tornadoes can happen together with tropical storms and hurricanes as they move onto land. Waterspouts are tornadoes that form over water.
The tornado season in the southern states of America is March through May; in the northern states, it is late spring through early summer. Tornadoes are most likely to occur between 3 p.m. and 9 p.m., but can occur at any time.
（1）From the passage, where may tornadoes come from?
A.Hurricanes.
B.Great heat.
C.Thunderstorms.
D.Sandstorms.
（2）What does the underlined word “obscure” probably mean?
A.Hide.
B.Reduce.
C.Produce.
D.Raise.
（3）When a tornado happens, ________.
A.it often reaches the speed of 70 MPH
B.it can only be seen in the late of the day
C.it may form on the surface of sea water
D.it only moves from southwest to northeast
（4）The passage makes us believe that ________.
A.tornadoes are mostly seen in the southern states of America
B.warnings about tornadoes are well developed in many countries
C.of all the natural disasters, tornadoes often cause the biggest damage
D.tornadoes may strike so quickly that there is often little or no warning

Answer 1

【答案】
（1）C
（2）A
（3）C
（4）D
【解析】本文是一篇說(shuō)明文，講述了龍卷風(fēng)的有關(guān)知識(shí)。
（1）考查細(xì)節(jié)理解。根據(jù)第一段中的“A tornado appears as a funnel-shaped (漏斗狀) cloud from a thunderstorm to the ground with whirling (飛快移動(dòng)) winds that can reach 300 miles per hour.”以及第三段中的“Tornadoes generally occur near the edge of a thunderstorm, when the strong wind may die down.”可知，龍卷風(fēng)起源于暴風(fēng)雨。故選C。
（2）考查詞義猜測(cè)。根據(jù)第二段中的“Some tornadoes can be seen clearly ...”可知，有些龍卷風(fēng)可以很清楚地看到，而有些龍卷風(fēng)被rain or nearby low-hanging clouds (雨或浮云)遮擋而看不清楚。hide表示“隱藏”，故選A。
（3）考查細(xì)節(jié)理解。根據(jù)第三個(gè)事實(shí)中的“Waterspouts are tornadoes that form over water.”可知，有些龍卷風(fēng)是在海面上形成。故選C。
（4）考查推理判斷。根據(jù)第二段中的“At many times, tornadoes develop so rapidly that little, if any, advance warning is possible.”可知，很多時(shí)候龍卷風(fēng)來(lái)得太快，以至于不可能提前發(fā)出警告。故D項(xiàng)正確。