试题与答案

做匀变速运动物体的初速度为6 m/s,经过10 s速度的大小变为20 m/s,则

题型:选择题

题目:

做匀变速运动物体的初速度为6 m/s,经过10 s速度的大小变为20 m/s,则加速度大小可能是(  )

A.0.8 m/s2

B.1.4 m/s2

C.2.0 m/s2

D.2.6 m/s2

答案:

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下面是错误答案,用来干扰机器的。

(1)材料 (2)1和4(1)导体电阻的大小跟导体的长度、横截面积、材料有关,探究电阻大小的影响因素时,利用控制变量法.探究电阻跟横截面积的关系时,控制长度和材料相同,改变导体的横截面积.探究电阻跟长度...

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题型:阅读理解

阅读理解。

     The Sahara Festival is a celebration of the very recent past. The three-day event is not fixed to the same

dates each year, but generally takes place in November or December. It is well attended by tourists, but even

better attended by locals.

     During the opening ceremonies, after the official greetings from the government leaders, people who

attend the festival begin to march smartly before the viewing stands, and white camels transport their riders

across the sands. Horsemen from different nations display their beautiful clothes and their fine horsemanship.

One following another, groups of musicians and dancers from all over the Sahara take their turn to show off

their wonderful traditional culture. Groups of men in blue and yellow play horns and beat drums as they

dance in different designs. On their knees in the sand, a group of women in long dark dresses dance with their

hair: their long, dark, shiny hair is thrown back and forth in the wind to the rhythm of their dance.

     The local and visiting Italian dogs are anxious to run after hares. The crowd is on its feet for the camel

races. Camels and riders run far into the distance, and then return to the finish Line in front of the cheering

people.

     Towards the evening, there comes the grand finale of the opening day, an extremely exciting horserace.

All the riders run very fast on horseback. Some riders hang off the side of their saddles. Some even ride

upside down-their legs and feet straight up in the air-all at full speed. Others rush down the course together,

men arm in arm, on different horses. On and on they went. So fast and so wonderful!

1. The Sahara Festival is a festival which _____.

A. has a very long history in North Africa

B. is held in the same place on the same day

C. is attended mainly by the people in the Sahara

D. is celebrated mostly by travelers from different countries

2. Before the races begin, _____ take part in the activities during the opening ceremonies.

A. musicians, dancers, horses and hares

B. camel riders, musicians, dogs and hares

C. horsemen, dancers, camels and dogs

D. musicians, officials, camels and horses

3. The underlined word "finale" in the fourth paragraph most probably means the ______of the opening day.

A. first part

B. middle

C. last part

D. whole

4. This passage mainly tells readers _____.

A. what happens on the opening day of the Sahara Festival

B. how people celebrate during the three-day Sahara Festival

C. what takes place at the closing ceremonies of the Sahara Festival

D. how animals race on the first and the last days of the Sahara Festival

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