问题 选择题

茂名的果农为提高荔枝、龙眼的坐果率,在果园里放养了一些蜜蜂。这体现了动物在自然界中的作用是

A.帮助植物传播种子

B.帮助植物传粉

C.维持生态平衡

D.促进生态系统的物质循环

答案

答案:B

题目分析:A、动物能够帮助植物传播果实和种子,有利于扩大植物的分布范围.如苍耳果实表面的钩刺挂在动物的皮毛上.但是在棚内放养了一些蜜蜂主要体现了动物帮助农作物传粉的作用,故此选项不正确;

B、自然界中的动物和植物在长期生存与发展的过程中,形成相互适应、相互依存的关系.动物能够帮助植物传粉,使这些植物顺利地繁殖后代,如蜜蜂采蜜.因此农民为了提高大棚农作物的结果率,在棚内放养了一些蜜蜂,这体现了动物在自然界中的动物帮助农作物传粉的作用,故此选项正确;C、食物链和食物网中的各种生物之间存在着相互依赖、相互制约的关系.在生态系统中各种生物的数量和所占的比例总是维持在相对稳定的状态,这种现象叫做生态平衡.如果食物链或食物网中的某一环节出了问题,就会影响到整个生态系统,而动物在生态平衡中起着重要的作用.但是在棚内放养了一些蜜蜂主要体现了动物帮助农作物传粉的作用,故此选项不正确;D、动物作为消费者,直接或间接地以植物为食,通过消化和吸收,将摄取的有机物变成自身能够利用的物质.这些物质在动物体内经过分解,释放能量,同时也产生二氧化碳、尿液等物质.这些物质可以被生产者利用,动物排出的粪便或遗体经过分解者的分解后,也能释放出二氧化碳、含氮的无机盐等物质.可见,动物能促进生态系统的物质循环.但是在棚内放养了一些蜜蜂主要体现了动物帮助农作物传粉的作用,故此选项不正确.

故选B.

完形填空
阅读下列材料,从所给的六个选项(A、B、C、D、E和F)中,选出符合各小题要求的最佳选项,并在答题卡上将该项涂黑。选项中有一项是多余选项。
The people below are going to make a trip in Australia. After the description of these people, there is information about six advertisements of organized tours A-F. Decide which tours would be most suitable for the person mentioned in descriptions 1-5 and then mark the correct letter (A-F) on your answer sheet. There is one extra paragraph about one tour which you do not need to use.
____小题1:Victor is fond of nature and adventure and he is making a study tour into geology in Australia. So he wants to make a whole day trip, enjoy the natural beauty and study geological phenomena as well.
____小题2: Vanessa is planning a short city tour of Sydney so that she can enjoy the highlights of the city and attend an important lecture given by Professor Brown Smith at 2:00 pm at the University of Sydney.
____小题3:Charlie and his friends are making their first journey in Australia. Having traveled around the city of Sydney, they plan to visit Canberra, the capital and political center of the country.
____小题4:Jenny, a European woman with her children is visiting her relatives in Australia. They want to relax themselves by enjoying the sunshine on the sandy beaches along the coast and have fun with dolphins.
____小题5: Mike and Susan are from Brazil. They have been traveling in Australia for a couple of days. This weekend, they would like to have a change and travel to the countryside to have some idea of Australia grape farming and wine producing instead of making city tours around.
A.City Highlights, Manly Beach, Northern Beaches
Tour the highlights of Sydney, then cross the Sydney Harbor Bridge to Manly and the Northern Beaches. Capture the beauty and lifestyle of the harbor city from Gray Line’s specially selected vantage points.
Departs: 8:30am Adult: $51.00
Returns: 11:50am Child:25.50
B.New Parliament House, National Museum,Australian War Memorial
The nation’s capital---a purpose built city, ultra modern, with imposing architecture yet a rural charm of lakeside, gardens and open spaces. This hi-tech city is the seat of Parliament and home of superb national monuments, museums and galleries.
Departs: 8:30am Adult: $110.00
Returns: 9:15pm Child:$55.00
C.Cuddle a Koala, Kangaroos, Harbour LuncheonCruise
Observe and meet our unique native animals with ample opportunity to get to know the Cuddly Koala. Then enjoy a spectacular luncheon cruise on beautiful Sydney Harbour. You can choose between the Matilda Cruises Sailing Catamarans, the streamlined Captain Cook Cruisers or Magistic Cruises.
Departs: 8:40am Adult: $115.00
Returns: 2:00pm Child: $57.50
D.Hunter Valley Wineries, Wine Tasting,Traditional Aussie Towns
World acclaimed Australian wines from the vineyards of the rolling hills and valleys of the Hunter region.The Hunter Valley is Australia’s oldest commercial wine producing district with over 7,000 acres under vine. Visit historic Wollombi and the Old Tavern, tour Cessnock and the lower Hunter Valley noted for its early Australiana townships and try local cheeses that compliment fine wines.
Departs: 8:40am                             Adult: $127.00
Returns: 6:45pm                             Child: $63.50
 E. Port Stephens, Central Coast Beaches, NorthCoast, Dolphin Watching
Discover the beautiful Central Coast north of Sydney with its holiday villages, white sandy beaches and the sparkling Pacific Ocean.
Ride the wave crests with the Dolphins in the azure waters of sheltered Port Stephens where forests, villages and stately homes meet with the sea. This quiet arm of the blue Pacific Ocean is home to a pod of nature’s most lovable and intelligent marine mammals.
Departs: 8:30am                             Adult: $126.00
Returns: 7:00pm                             Child: $63.00
 F. Jenolan Caves, Blue Mountains, AdventureCaves
The Blue Mountains National Park is a kaleidoscope of contrasts and colour rich in Australian bush and wildlife, always with a distant blue haze horizon. Spectacular Jenolan Caves --- the brilliance and timelessness of nature are revealed. Been thralled with the beauty of these ancient limestone caves.
Departs: 8:40am                             Adult:$114.00
单项选择题