问题 选择题

控制植物蒸腾作用强弱的结构是

A.气孔

B.叶片

C.表皮细胞

D.叶肉细胞

答案

答案:A

题目分析:保卫细胞之间形成的凸透镜状的小孔称为气孔,气孔在呼吸、蒸腾作用等气体代谢中,成为空气和水蒸汽的通路,其通过量是由保卫细胞的开闭作用来调节,保卫细胞吸水时,细胞膨胀,细胞厚度增加,两细胞分离,气孔张开;保卫细胞失水时,细胞收缩,细胞厚度减小,两细胞合并,气孔闭合。所以控制蒸腾作用强弱的结构是气孔。

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14 days from just £2,090 pp

Fully Inclusive from the UK

Price covers: International airfares, departure taxes, fuel charges, local transportation, accommodation, all meals, entrance fees, guides, daily tours and visas for UK citizens.

◆Days 1~3:UK—Shanghai

Fly to the great city of Shanghai and in the evening sample traditional Shanghai food. Visit the beautiful Yu Gardens, Old Town, Shanghai Museum, cross the Great Nanpu Bridge and tour the Pudong area. Also explore Xintiandi with its 1920’s style Skikumen Buildings and end your stay in Shanghai with an amazing Huangpu River evening tour.

◆Days 4~7: Shanghai-Yangtze River Tour

Fly to Yichang and change(approx. one hour) to board your Yangtze River ship for the next four nights. Enjoy a tour of the Three Gorges Dam(三峡大坝) before sailing on the grand Yangtze River, passing through the impressive Three Gorges. We take a side trip to the Lesser Three Gorges or travel up the Shennong Stream in a peapod boat and enjoy various shore trips along the way.

◆Day 8: Chongqing-Chengdu

Get off in Chongqing and drive to Chengdu for an overnight stay.

◆Days 9~10:Chengdu-Xi’an

Visit the famous Panda Reserve to see the lovely animals. We then fly to the historic city of Xi’an for two nights’ stay and enjoy traditional Shui Jiao. Next day, explore one of the most important discoveries of the 20th Century-the Terracotta Warriors(兵马俑), followed by the ancient City Wall and a performance of Tang Dynasty dancing.

◆Days 11~13: Xi’an-Beijing

Visit Little Wild Goose Pagoda and see the ancient objects at the well-known Shaanxi Provincial Museum before walking through the lively Muslim Quarter to see the Great Mosque. Later fly to Beijing for three nights’ stay and try Peking Duck. During our stay in Beijing, we stroll through Tiananmen Square to the Forbidden City, the largest and best preserved collection of ancient buildings in China, and visit the Summer Palace. Next day we take a walk on the Great Wall, tour the unique Temple of Heaven and enjoy an attractive Chinese Acrobatic Show.

◆Day 14: Beijing-UK

Fly back to the UK, arriving home later the same day filled with happy memories.

小题1:The first and last scenic spots to be visited in Xi’an are           .

A.the Terracotta Warriors and Shaanxi Provincial Museum

B.the Terracotta Warriors and the Great Mosque

C.Little Wild Goose Pagoda and the Great Mosque

D.Little Wild Goose Pagoda and the Muslim Quarter小题2:The underlined word “sample” in the passage probably means “     ”.

A.buy

B.reserve

C.taste

D.make小题3:The ad is mainly intended to        .

A.provide the British with a better understanding of China

B.attract the British to traditional Chinese food

C.offer services of booking air tickets to tourists

D.encourage the British to travel in China小题4:Which of the following is TRUE according to the ad?

A.The tourists will stay in Beijing for three nights before leaving for the UK.

B.The tourists will visit the 1920’s Shikumen buildings in Beijing.

C.The tourists will take a side trip to the Three Gorges Dam during the tour.

D.The tourists will have to pay extra for fuel and meals.