Wallace’s giant bee is the world’s 【小题1】 (large) bee, with a body the size of a human thumb and wings that can spread to about 2.5 inches. That may sound 【小题2】 (frighten), but the bee isn’t likely to hurt anyone. It uses its large jaws (嘴) to collect a sticky goo, called resin, from trees. The bee 【小题3】 (make) its home in termite mounds (白蚁丘) found on trees, using the resin to protect its nest from the termites. Until recently, the bee had been seen by scientists only 【小题4】 (two), once in 1868 and again in 1981.

Many people are afraid of sharks. Many films and TV shows will also tell you that sharks are 【小题1】(frighten).   But that's simply not true and the world would not be better without them. Sharks play 【小题2】 important role in the ocean. Many sharks are top predators(捕食者)【小题3】 control the populations of other animals. Other sharks serve as clean-up animals,【小题4】（eat) birds when they fall out of the sky. But not all sharks eat meat. Some, like the whale sharks, are peaceful seagrass eaters.

As a group, sharks are much older 【小题5】 we human beings are. The first shark-like fish 【小题6】（appear)more than 400 million years ago. Sharks were swimming in the oceans before dinosaurs lived on the planet. They survived from the extinction that killed 75% of all living 【小题7】(species) on Earth, which is why sharks 【小题8】（consider)“living fossils(活化石）”.

Sharks also have a variety of fascinating talents. They have sharp noses and use them 【小题9】(detect) signals from other animals. Sharks have very big, oily livers(肝脏）．The oil in their livers 【小题10】(actual) helps them float.

As is well-known to us all, ants move between their home and sources of food frequently, 【小题1】 which their survival depends. Motsch and his colleagues wondered if ants on the move could get 【小题2】 （stick）in the jams.

Therefore, they controlled traffic density（密度）by constructing bridges of a 【小题3】 （vary）of widths between ants' home and a source of food. 【小题4】 only goal was to try to find out at what point they would have a traffic jam. They just waited and watched. But the ants never, at one point, just stopped.

The flow of ants did increase as ants started to fill the bridge. But it never slowed down, even when the bridge was crowded with ants. The researchers then 【小题5】 （far）looked at how the behavior of an individual ant affected traffic. They found when ants 【小题6】 （sense）overcrowding, they adjusted their speeds and avoided entering high-density areas and running into each other, thus 【小题7】 （prevent）jams.

Can ants help us solve our own traffic problems? “Not likely,” says Motsch. That's 【小题8】 when it comes to getting from point A to point B as fast as possible, human drivers put their own goals first. Ants have no choice but 【小题9】 （be）more cooperative in order to feed 【小题10】 （they）.