问题 填空题

声音在空气中的传播速度是______ m/s,合______km/h,人对高墙喊一声,若4钞后听到回声,则人距高墙是______m.

答案

声音在空气中的传播速度是340m/s=

0.34km
1
3600
h
=1224km/h;

由v=

s
t
得:s=vt,由题意知,声音从人到高墙的传播时间是2s,

则人与高墙的距离:s=340m/s×2s=680m.

故答案为:340;1224;680.

单项选择题 A1/A2型题
阅读理解

England will play Italy, Uruguay and Costa Rica in a tough Group D at the 2014 World Cup in Brazil. Roy Hodgson's men open their campaign against Italy in the Amazonian city of Manaus on 15 June in the only World Cup game which kicks off at 02:00 BST. England take on Uruguay on 19 June and play Costa Rica five days later.

Hosts Brazil are in Group A with Cameroon, Mexico and Croatia while the World Cup holders Spain open with a repeat of the 2010 final against Netherlands.

England will have to travel 1,777 miles from their chosen base in Rio for their first match in the tropical heat of Manaus.

Earlier this week Hodgson described Manaus as "the place to avoid" because of the climate—temperatures reach 30C and humidity is about 80%—although after the draw the England boss took comfort from the fact his team face a fellow European side.

"The conditions in the north will be tough, so we will both be in same boat," he said. "If we'd had three games up in the north, it would have been difficult."

Following Hodgson's initial comments, the mayor of Manaus, Arthur Virgilio, said England would not be welcome in the city.

England takes on two-time champions Uruguay in Sao Paulo and they play Costa Rica in Belo Horizonte—both cities are within 225 miles of their base.

England have never previously beaten Italy or Uruguay at a major tournament(锦标赛), while they have never faced Costa Rica.

Uruguay, who reached the semi-finals in 2010, and Italy, who knocked Hodgson's men out of Euro 2012, are ranked sixth and seventh respectively in the Fifa rankings while Costa Rica are 31st in the world - 18 places below England.

小题1:When and where will England play its third group stage match?

A.On 24 June; in Manaus

B.On 24 June; in Belo Horizonte

C.On 19 June; in Manaus

D.On 19 June; in Sao Paulo小题2:Which of the following can England take comfort from?

A.The place where its first match in the group stage is held.

B.The distance from its base to where its first match is held.

C.The fact that two of its group stage games are not in the north.

D.The fact that it is 7 places below Uruguay in the Fifa rankings.小题3:Which of the following is true according to the news report?  

A.Roy Hodgson is the coach of Brazil national football team.

B.Netherlands took the second place in the last World Cup.

C.The mayor of Manaus is a fan of the British soccer team.

D.England has never played against Uruguay in the history.