Question

18．A solar bag is a long plastic bag made from very thin plastic and colored black to take in solar energy．The heated air inside the bag causes the bag to float．Although the solar bag looks similar to a regular black trash bag，the key difference is the thickness of the plastic．A great science experiment might be testing bags of different thicknesses to see which one floats the highest!
Materials
v  Solar bag
v  Solar bag string
Notice that the bag is made out of a lightweight plastic material．Be careful when dealing with the bag since the pla stic will tear easily．
Carefully take the plastic bag from the packaging and hold one of the op en end of the bag．Tie this end with string．
The best time for a launch is in the cool morning．We have not had much success with a launch in the middle of a hot day．
Choose a proper place for the launch．Find a field clear of any buildings，trees and power lines．Choose a day to do the experiment when it is sunny and free of any wind．
Put the solar bag onto a soft surface like grass．Have one person hold the bag open as you begin to run around and fill the bag with air．
Fill the bag with air until about 2 feet remains without air so that you can hold it in your hand．Close the end and use a string to keep it on the ground．
The last part of the work is done by the sun．Gather around the giant bag but try not to touch it-sharp fingernails will easily break the thin plastic．Be careful!The outside of the bag also gets very hot to the touch．It's important to remember that it may t ake as long as ten minutes for the air inside to heat up enough to cause the bag to float．
25．What's the difference between a Solar Bag and a regular black trash bag？B
A．The weight．
B．The thickness．
C．The material．
D．The color．
26．The best time to launch a Solar Bag is inA．
A．a sunny cool morning without any wind
B．a sunny hot afternoon without any wind
C．a sunny cool morning with some wind
D．a sunny hot afternoon with some wind
27．A good place for a launch isB．
A．between buildings                    
B．in an open area
C．on top of a tree                       
D．near a power station．

Answer 1

分析 本文是一篇說明文．文章主要介紹了太陽能包的特點，以及我們如何做一個太陽能包．

解答 25．B  細節(jié)理解題   根據(jù)文章第一段第三句Although the solar bag looks similar to a regular black trash bag，the key difference is the thickness of the plastic．可知，與普通包的區(qū)別是塑料的厚度，故答案為B
26．A  細節(jié)理解題 根據(jù)文章The best time for a launch is in the cool morning．We have not had much success with a launch in the middle of a hot day．可知，使用太陽能包的最佳時間是無風的晴朗的涼爽早晨，故答案為A
27．B 細節(jié)理解題 根據(jù)文章Choose a proper place for the launch．Find a field clear of any buildings，trees and power lines．Choose a day to do the experiment when it is sunny and free of any wind．可知使用太陽能包最佳的地點是空曠的地方，故答案為B

點評 本文考查細節(jié)題為主，細節(jié)題可以在文章中直接找到與答案有關的信息？或是其變體．搜查信息在閱讀中非常重要它包括理解作者在敘述某事時使用的具體事實、數(shù)據(jù)、圖表等細節(jié)信息．在一篇短文里大部分篇幅都屬于這類圍繞主體展開的細節(jié)．做這類題一般采用尋讀法？即先讀題，然后帶著問題快速閱讀短文，找出與問題有關的詞語或句子，再對相關部分進行分析對比，找出答案