【推荐2】In a village, there was a small pond (池塘). Three ______ lived in it. They were best friends. They were ____ together, and never swam very far without their friends.

One day, a fisherman came to this pond. ______ he saw the fish swimming around, he went back and told other fishermen to come as well.

As the fish saw this, they got ______. They didn’t want to become food. The ______ fish among them said, “We must find another pond and leave quickly.” One fish agreed, but ______ didn’t want to leave. He felt that this pond was their home and he had many good memories (记忆) there. He said, “We should not be afraid of ______, for this pond is our home.”

The other ______ fish tried hard to make their friend leave, but they couldn’t. ______ they decided to leave for a new pond. On the following ______, when the fishermen arrived, they caught the fish in the pond and took it home for a great meal.

【推荐3】Blue whales are the largest animals in the world. But they are amazing _______ because of their huge size, but their slow heartbeat.

For the first time , scientists have researched the _______ of a blue whale. They found _______ when blue whales dive (潜水) for food, their heart rates (心率) are as _______ as 2 beats per (每) minute (bpm). Scientists used to _______ that their diving heart rate was 15 bpm. When the whales go to the ocean’s _______ to breathe, their heart rate is between 25 and 37 bpm.

Usually, the larger an animal is, _______ its heart beats, since it takes more time to pump (输送) blood around _______ body. Shrews, the smallest mammals (哺乳动物), have a heart rate of up to 1,000 bpm. Humans usually stay between 60 and 100 bpm.

_______ slowing their heart rate, blue whales can send more blood to the muscles (肌肉) that they use ________. These muscles become stronger, allowing the whales to dive for longer periods of time.

【推荐2】___________ of you like to buy a hamburger for lunch or eat some cookies between classes? They are yummy and easy ___________ around.

But remember ___________ at the package. Is there any trans fat（反式脂肪酸）? Most trans fats are man-made. People make them ___________ adding hydrogen（氢）to vegetable oil. Such oil gives food a longer shelf life（保质期）and a_____________ taste.

However, research finds that trans fats are very ___________. They cause heart diseases. Many countries, such as Denmark, have stopped_____________ trans fats. Now the US is also ___________ banning（禁止）it. There is no such ban in China. It is mainly because Chinese diets have ___________ fewer trans fats than those in the West, said food safety experts. But young people should ____________, as cakes and cookies often have trans fats. Some fast food restaurants also use oil with trans fats to fry______________ they last longer.

In recent years, many food companies have started to use fewer trans fats. For example, KFC in China said in 2006 that their food contains no trans fats. You can have a look at a product's package____________ buying. If the food has trans fats, there should be information about how much it______________. It is law in China. How much trans fat is safe? The World Health Organization says that an adult ____________ eat no more than 2.2 grams of trans fats a day.

A worldwide problem

Trans fats are a "yummy trap（陷阱）", many people have said. They taste better than natural oil. Cakes and cookies made with trans-fat oil are much softer. But trans fats have____________ nutritional benefit（营养价值）at all.