9．The Cabbage White butterfly （菜粉蝶） has a natural range across Europe，Asia，and North Africa．To many farmers，the butterflies are regarded as a pest（害蟲 ）； to others，they are pretty to look at．Researchers are looking into new ways to make efficient photovoltaic（光電的） energy and for this they have been inspired by the v-shape posture of the Cabbage White butterfly．Photovoltaic energy is the science behind solar power，where light is turned into electricity．
To improve the collection of sunlight，a research group have been inspired by the resting posture of the Cabbage White butterfly．The butterfly keeps a"v"shape in order to heat up its flight muscles before taking off．By creating solar panels（板）in this shape，scientists think that the quantity of power that a solar panel can use can be increased by around 50 percent．
The crucial part is the weight of solar panels．For this the researchers developed a kind of material that is lightweight．The Cabbage White butterfly is different to many other butterflies because it is using the v-formation．On cloudy days common butterflies need to wait to receive enough sunlight in order to fly．However，by owning the v-shape posture the Cabbage White butterfly is able to receive more energy more quickly than other butterflies．In addition，the butterfly can flash back sunlight from its wings，which allows its flight muscles to be warmed up to the best temperature．
The new research was done at the University of Exeter's Environment and Sustainability Institute （ESI）．Dis cussing the findings，lead researcher Professor Tapas Mallick stated："This engineering is not new．However，this research，which shows ways to develop low-cost solar power，has not been done before．"
19．What does the underlined word"crucial"in Paragraph 3 mean？A
A．Important．B．Easy．C．Useful．D．New．
20．Which is the main benefit of the butterfly's v-shape wings？D
A．They always keep the butterfly warm．
B．They can help the butterfly fly much higher．
C．They can help the butterfly avoid danger．
D．They can help the butterfly get more sunlight．
21．Common butterflies need to wait on cloudy days becauseB．
A．they wait to get enough wind
B．they lack enough energy to fly
C．their muscles need to move first
D．they wait to turn wings to a V shape
22．What can be a suitable title for the text？A
A．Butterflies inspire new types of solar power
B．How to develop the new kind of solar power
C．Butterflies help the scientists do research
D．A new achievement about solar power．
分析 本文介紹了科學(xué)家從菜粉蝶的V型體態(tài)得到啟示，研究出了V型的太陽能電池板，這種電池板可以有效提高吸收的太陽能．
解答 19．A．詞義猜測題．根據(jù)畫線詞下文"For this the researchers developed a kind of material that is lightweight．"可知，研究人員為此研究出來一種重量很輕的材料．由此可推知，太陽能板的重量是很重要的一個部分，所以研究人員才針對這個問題研究出輕質(zhì)的材料．畫線詞的含義是"重要的"．
20．D．細節(jié)理解題．根據(jù)第三段"However，by owning the v-shape posture the Cabbage White butterfly is able to receive more energy more quickly than other butterflies．"可知，菜粉蝶的V型翅膀可以幫助它們獲得更多的陽光．
21．B．細節(jié)理解題．根據(jù)第三段"On cloudy days common butterflies need to wait to receive enough sunlight in order to fly．"可知，普通蝴蝶在陰天需要等翅膀吸收足夠多的陽光后才能飛行，因為它們需要足夠的陽光來產(chǎn)生能量．由此可知，普通蝴蝶在陰天要等待是因為它們?nèi)鄙僮銐虻娘w行所需的能量．
22．A．標題判斷題．本文介紹了研究人員從菜粉蝶的V型體態(tài)中得到啟示，研究出了更高效的太陽能板．由此可知答案．
點評 本文是一個科教類閱讀理解，題目涉及多道細節(jié)理解題，做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進行仔細分析，結(jié)合選項選出正確答案．推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案，切忌胡亂猜測，一定要做到有理有據(jù)．
