Very high waves are destructive when they strike the land. F..

第1题

From the second paragraph of the passage we know that the power of very high waves strikin

g the shore is ______.

A．constant

B．equalized

C．variable

D．perpetual

点击查看答案

第2题

听力原文：Nuclear energy is released at the sun's center as high energy gamma radiation, a

form. of electromagnetic radiation like light and radio waves, only of very much shorter wavelength.

The wavelengths of light and radio waves, unlike high energy gamma radiation, are much shorter.

A．正确

B．错误

点击查看答案

第3题

It is clear from the passage that coastal depth ______.A．is the only factor influencing th

It is clear from the passage that coastal depth ______.

A．is the only factor influencing the strength of high waves

B．influences the power of high waves

C．has no influence upon the strength of very high waves

D．is irrelevant to the question of the power of high waves

点击查看答案

第4题

It is obvious that the depth of the sea near the coast ______.A．is the major factor influe

It is obvious that the depth of the sea near the coast ______.

A．is the major factor influencing the strength of high waves

B．influences the strength of high waves only slightly

C．has influence only upon the strength of very high waves

D．doesn't have connection with the power of high waves

点击查看答案

第5题

From the second paragraph we know that high waves striking the shore are ______.A．graduall

From the second paragraph we know that high waves striking the shore are ______.

A．gradually reduced

B．difficult to predict

C．still very powerful

D．sometimes quite weak

点击查看答案

第6题

Task 2Directions: This task is the same as Task 1.The 5 questions or unfinished statements

Task 2

Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45.

Very high waves are destructive when they strike the land. Fortunately, this seldom happens. One reason is that out at sea, waves moving in one direction almost always run into waves moving in a different direction. The two sets of waves tend to cancel each other out. Another reason is that water is shallower near the shore. As a wave gets closer to land, the shallow bottom helps reduce its strength.

But the power of waves striking the shore can still be very great. During a winter gale, waves sometimes strike the shore with the force of 6,000 pounds for each square foot. That means a wave, 25 feet high and 500 feet along its face, may strike the shore with a force of 75 million pounds.

Yet the waves, no matter how big or how violent, affect only the surface of the sea. During the most raging storms, the water a hundred fathoms(600 feet) beneath the surface is just as calm as on a day without a breath of wind.

According to the passage, destruction caused by high waves occurs ______.

A．regularly

B．rarely

C．always

D．predictably

点击查看答案

第7题

Very high waves are destructive when they strike the land. Fortunately, this seldom happen

s. One reason is that out at sea, waves moving in one direction almost always run into waves moving in a different direction. The two sets of waves tend to cancel each other out. Another reason is that water is shallower near the shore. As a wave gets closer to land, the shallow bottom helps reduce its strength.

But the power of waves striking the shore can still be very great. During a winter gale, waves sometimes strike the shore with the force of 6,000 pounds for each square foot. That means a wave, 25 feet high and 500 feet along its face, may strike the shore with a force of 75 million pounds.

Yet the waves, no matter how big or how violent, affect only the surface of the sea. During the most raging storms, the water a hundred fathoms(600 feet) beneath the surface is just as calm as on a day without a breath of wind.

According to the passage, destruction caused by high waves occurs ______.

A．regularly

B．rarely

C．always

D．predictably

点击查看答案

第8题

Task 1Directions: After reading the following passage, you will find 5 questions or unfini

Task 1

Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, and D. You should make the correct choice.

Very high waves are destructive when they strike the land. Fortunately, this seldom happened. One reason is that out at sea, waves moving in one direction almost always run into waves moving in a different direction. The two sets of waves tend to cancel each other out. Another reason is that water is shallower near the shore. As a wave gets closer to land, the shallow bottom helps reduce its strength.

But the power of waves striking the shore can still be very great. During a winter gale (大风), waves sometimes strike the shore with the force of 6 000 pounds for each square foot. That means a wave, 25 feet high and 500 feet along its face, may strike the shore with a force of 75 million pounds.

Yet the waves, no matter how big or how violent, affect only the surface of the sea. During the most violent storms, the water a hundred fathoms (600 feet) beneath the surface is just as calm as on a day without a breath of wind.

According to the passage, destruction caused by high waves occurs ______.

A．regularly

B．rarely

C．frequently

D．suddenly

点击查看答案

第9题

What can we learn about the tsunami waves generated by the earthquake？（)A． The tsunami w

What can we learn about the tsunami waves generated by the earthquake？ ()

A． The tsunami waves as high as 25 meters arrived immediately after the earthquake．

B． The tsunami waves killed 200 people and sank all the boats．

C． The tsunami waves were very destructive．

D． The tsunami waves flooded half of the inland．

点击查看答案

第10题

If we observe carefully, we can find that most of the flowers in nature are red, orange an

d yellow. If we have seen a black flower, it is a chance in a million. People have made census (普查) to colors of more than four thousand kinds of flowers and discovered that only eight of them are black. Why？

As we know, sunlight is formed by seven different kinds of colored light. The wave length of each light changes, so the quantity of heat in each light changes, too. Flowers, especially their petals (花瓣) , are very weak and easy to the harm caused by high temperature. Black flowers can take in all the light waves, which cause the flowers to dry up in a high temperature. So the black flowers can hardly continue their lives. But red flowers, orange flowers and yellow ones can protect themselves from sunlight by reflecting (反射) the red light, orange light and yellow light, each of which has a large quantity of heat.

That is why red, orange and yellow flowers are very common in nature while black flowers are so unusual.

We can hardly find black flowers because ______.

A．they are easy to be eaten by animals

B．there are no black flowers in the world

C．the petals of black flowers are too strong

D．the light waves make the flowers dry up

点击查看答案