Earthquakes occur without warning; however, it is claimed that some animals can feel e
A、prior to
B、resort to
C、back off
D、saddle with
A、prior to
B、resort to
C、back off
D、saddle with
Only rarely ______ earthquakes occur in the United States east of the Mississippi River.
A.had
B.when
C.that
D.do
What did scientists learn about earthquakes at the Rocky Mountain Arsenal?
A.They occur at about 4,000 meters below ground level.
B.The injection of water into earthquake faults prevents earthquakes from occurring.
C.They are usually caused by the oil in the faults.
D.Harmful earthquakes can be possibly prevented by causing small, harmless earthquakes.
What did scientists learn about earthquakes at the Rocky Mountain Arsenal?
A) They occur at about 4,000 metres below ground level.
B) The injection of water into earthquake faults prevents earthquakes from occurring.
C) They are usually caused by the oil in the faults.
D) Harmful earthquakes earl be possibly prevented by causing small, harmless earthquakes.
This selection proves that ______.
A.man is often unable to control the power of nature
B.earthquakes occur most often during nighttime hours
C.the direction of an earthquake can be detected (= discovered)
D.university study the cause of earthquakes
The great majority of all earthquakes occur in two specific geographic areas. One such area covers the Pacific Ocean and its bordering landmasses. The other extends from the East Indians to the Atlas Mountains, including the Himalayas, Iran, Turkey, and the Alpine regions. It is in these two great belts or zones that ninety percent of all earthquakes take place; they may, however, happen anywhere at any time.
This element of the unknown has for centuries added greatly to the dread and horror surrounding earthquakes, but in recent times there have been indications that earthquake forecast may be possible. By analyzing changes in animal behavior, patterns of movements in the earth‟s shell, variations in the earth‟s force of attraction, and the frequency with which minor earth shakes are observed, scientists have shown increasing success in expecting when and where earthquakes will strike. As a result, a worldwide earthquake warning network is already in operation and has helped to prepare for (and thus lessen) the vast destruction that might otherwise have been totally unexpected.
It is doubtful that man will ever be able to control earthquakes and get rid of their destructiveness altogether, but as how and why earthquakes happen become better
understood, man will become more and more able to deal with their possible damage before they occur.
1.Which of the following statements is true according to the passage?
A. Earthquake destruction is declining
B. Earthquake forecast is improving
C. Man is no longer fearful of earthquakes.
D. Man is capable of conquering earthquakes
2.We can infer from the passage that quakes __________.
A. may happen anywhere at any time
B. mostly strike in oceans and mountains
C. are unobservable in masses of land
D. are hardly the direct cause of fatalities
3.The phrase “this element of the unknown” (Paragraph 3) refers to ___________.
A. the extension of earthquake zones
B. the percentage of earthquake occurrences
C. when and where earthquakes may occur
D. what big damage earthquakes may cause
4.Man‟s research on earthquake forecast at present is to ____________.
A. reduce the loss from earthquake disasters
B. lower the frequency of earthquakes
C. release the energy that causes earthquakes
D. analyze the relationship between different earthquakes
5. Which of the following describes the author‟s purpose in writing the passage?
A. Inform. the reader
B. Entertain the reader
C. Disprove a concept
D. Question a concept
The San Andreas fault is ______.
A) an active fault system
B) a place where earthquakes have been predicted accurately
C) a place where earthquakes have been controlled
D) the location of the Rocky Mountain
The San Andreas fault is______.
A.an active fault system
B.a place where earthquakes have been predicted accurately
C.a place where earthquake have been controlled
D.the location of the Rocky Mountain
In winter, traffic accidents occur ______ on the highway.
A.frequently
B.suddenly
C.usually
D.rapidly
A、玻璃体:T1 WI低信号、T2 WI高信号
B、巩膜:T1 WI低信号、T2 WI低信号
C、房水:T1 WI高信号、T2 WI高信号
D、眼外肌:T1 WI中等信号、T2 WI略低信号
E、视神经:T1 WI中等信号、T2 WI中等信号