①一个基因决定一种性状

②一个基因影响多种性状

③多个基因决定一种性状

④环境对性状有影响

The Farmers' Fresh Market

    This morning，I went to the Farmers Market in Burlington ，Vermont. I didn't know what the Farmers Market is or how to get there.____

    First ，I had to decide how to go there，and I chose both to walk and to take a bus. When I went，I would walk and when I came back，I would take a bus.____

Walking to the market in this city，I was surprised because every house was beautiful，and they were all arranged in good order. In Korea's cities，most houses are not like that，and many apartments are like boxes which often screen off beautiful views like hills and mountains. Also，every road is not straight and narrow.____

    ____It was a very small market，but a very interesting one. I don't know why farmers go there to sell vegetables or why people go there to buy them because there are many more products in large supermarkets.____

    Also ，all the things sold there were very novel. In addition to fresh food，there was homemade food and many other things such as woolen blankets，quilts ，and wooden products.

    I wanted to buy some of them，but I didn't need them，so I just looked at them. It was a very exciting experience.

A. I visited a flower stand at the market.

B. Anyway，I was able to find the Farmers' Market.

C. So, to me, this American town was very impressive.

D. I decided to go early because the market is held in the morning.

E. I knew that it would take a long time to walk，but I wanted to see an American town.

F. I was attracted by the comfortable houses where they lived and the cars that they drove.

G. I think the reason is that the ones sold in the Farmers' Market are fresher and cheaper.

我国南方地区主要的糖料作物和油料作物分别是（    ）

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Tail Spin

    Two dolphins race around in a big pool in the Ocean Park. The smaller dolphin Grace, shown off a few of her tricks, turning around and waving hello to the crowd. The most amazing thing about her, however, is that she's even swimming at all. She doesn't have a tail.

    Grace lost her tail as a baby when she got caught up in a fish trap. When the dolphin arrived at the Ocean Park in December 2005, she was fighting for her life. “Is she going to make it?” Her trainer, Abbey Stone, feared the worst. Grace did make it --- but her tail didn't. She ended up losing her flukes and the lower part of her peduncle.

    Over the past six years, she has learned to swim without her tail. Dolphins swim by moving their flukes and peduncle up and down. Grace taught herself to move another way---like a fish! She pushed herself forward through the water by moving her peduncles from side to side.

    The movement put harmful pressure on Grace's backbone. So a company offered to create a man-made tail for her. The tail had to be strong enough to stay on Grace as she swam but soft enough that it wouldn't hurt her.

    The first time Grace wore the artificial tail. She soon shook it off and let it sink in the bottom of the pool. Now, she is still learning to use the tail. Some days she wears it for an hour at a time, others not at all. “The tail isn't

necessary for her to feel comfortable,” says Stone, “but it helps to keep that range of motion(动作) and build muscles(肌肉).”

    Now, the dolphin is about to get an even happier ending. This month, Grace will star in Dolphin Tale, a film that focus on her rescue and recovery. Her progress has inspired more than just a new movie. Many people travel from near and far to meet her. Seeing Grace swim with her man-made tail gives people so much courage.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。