阅读理解 　　 Some animal behaviorists argue that certain animals can remember past events, 　　anticipate future ones, make plans and choices, and coordinate activities within 　　a group. These scientists, however, are cautious about the extent to which animals 　　can be credited with conscious processing. (5) Explanations of animal behavior that leave out any sort of consciousness at 　　all and ascribe actions entirely to instinct leave many questions unanswered. 　　One example of such unexplained behavior: Honeybees communicate the sources of 　　nectar to one another by doing a dance in a figure-eight pattern. The orientation 　　of the dance conveys the position of the food relative to the sun''s position in the sky, (10)and the speed of the dance tells how far the food source is from the hive. Most 　　researchers assume that the ability to perform and encode the dance is innate and shows 　　no special intelligence. But in one study, when experimenters kept changing the site of the 　　food source, each time moving the food 25 percent farther from the previous site, foraging 　　honeybees began to anticipate where the food source would (15)appear next. When the researchers arrived at the new location, they would find the 　　bees circling the spot, waiting for their food. No one has yet explained how bees, 　　whose brains weigh four ten-thousandths of an ounce, could have inferred the location 　　of the new site. Other behaviors that may indicate some cognition include tool use. Many (20)animals, like the otter who uses a stone to crack mussel shells, are capable of using objects in the 　　natural environment as rudimentary tools. One researcher has found that mother chimpanzees 　　occasionally show their young how to use tools to open hard nuts. In one study, chimpanzees 　　compared two pairs of food wells containing chocolate chips. One pair might contain, say, five 　　chips and three chips, the other (25)our chips and three chips. Allowed to choose which pair they wanted, the 　　chimpanzees almost always chose the one with the higher total, showing some sort of summing 　　ability. Other chimpanzees have learned to use numerals to label quantities of items and do simple sums.

单选题 What does the passage mainly discuss?

单选题 Which of the following is NOT discussed as an ability animals are thought to have?

单选题 What is the purpose of the honeybee dance?

单选题 The word "yet" in line 16 is closest in meaning to

单选题 What did researchers discover in the study of honeybees discussed in paragraph 2?

单选题 It can be inferred from the passage that brain size is assumed to

单选题 Why are otters and mussel shells included in the discussion in paragraph 3?

单选题 The word "rudimentary" in line 21 is closest in meaning to

单选题 It can be inferred from the statement about mother chimpanzees and their young (lines 21-23) that young chimpanzees have difficulty

单选题 The phrase "the one" in line 26 refers to the

单选题 Scientists concluded from the experiment with chimpanzees and chocolate chips that chimpanzees