问题 选择题

在“07年特奥会”开幕式上,观众甲距离现场表演者34米,观众乙在距离电视台3400米的家中电视机里观看现场直播,关于甲、乙两位观众听到表演者声音的说法中正确的是(  )

A.甲先听到

B.乙先听到

C.同时听到

D.无法判断

答案

甲听到的声音是由空气传播来的,

乙听到的声音是通过电磁波传播的,

∵v=

s
t

∴甲听到声音需要的时间:

t=

s
v空气
=
34m
340m/s
=0.1s,

乙听到声音需要的时间:

t=

s
v电磁波
=
3400m
3×108m/s
≈1.13×10-5s,

则乙先听到声音;

故选B.

完形填空

阅读下面短文,根据内容完成句子。

Gregg Bleakney’s dream was to travel the Americas from top to Bottom. He got the idea after he finished a long bike ride. Gregg’s friend, brooks Allen, also liked riding a bike. The two friends talked and made a plan: they would travel from Alaska to Argentina—by bike.

To pay for the trip, Gregg and Brooks worked to save money for a long time. Once they were on the road, they often camped outdoors and ate cheaply. In many places, local people opened their doors to the two friends and gave them food.

On their way, there were deserts, rainforests and mountains. They visited modern cities and ancient ruins (遗迹) such as Machu Picchu in Peru. And they made many friends from all over the world.

In May 2007—two years, twelve countries, and over 30,500 kilometres later—Gregg finally reached Ushuaia, Argentina. (Near Guatemala, Brooks had to go back and Gregg continued without him.)

The trip taught both men a lot about traveling. What did they learn? Here is some of Gregg’s advice:

Travel light. You should carry many things with you.

Be flexible (灵活). Don’t plan everything. Then you’ll be more relaxed and pleased especially if there are problems.

Be polite. one traveler told Gregg, “Nobody wants to fight or cheat a nice man.” It’s true.

小题1:Gregg Bleakney’s dream was to _______________.

小题2:Before traveling, the two friends _____________to pay for the trip.

小题3:___________ got to Ushuaia, Argentina in May 2007.

小题4:According to the passage, if you plan everything for a trip, __________.

小题5:One traveler told Gregg that nobody wanted to _______________.

问答题