Directions : After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with, a given word，fill in each blank with the proper form of the given word ； for the other blanks，use one word that best fits each blank.
What is an insect? Insects of all kinds have existed on earth for millions of years. Sometimes we think of all insects as pests. Human life, however, would have a difficult time continuing without insects, ___21___ they pollinate plants and are a food source for many animals. Besides, insects, especially the social ___22___，are fascinating.
One very interesting and useful social insect is the honey bee. Bees ___23___ (consider) social insects because they live and work together. The bee lives in a beehive with other worker bees, and with the queen, who can lay thousands of eggs a day. The worker bees make wax used ___24___ (create) new cells inside the hive. Humans use this valuable beeswax ___25___ candles，cosmetics, expensive furniture polish, and other products. They also produce honey, a valuable food for humans (as well as for bees).
Another fascinating social insect is ___26___ ant. Many types of ants live in colonies underground. There thousands of them build and maintain their “city”. They also cooperate to provide food, sometimes in a manner that looks like human. For example, some ants actually raise their own food. One type of ant “farmer” keeps and cares for tiny insects that suck sweet sap (汁液)from plants. Ant farmers milk them from the sap, just like actual farmers milk cows. The sap is then given as food to young ants and to the queen, ___27___ main duty is to lay eggs. Another type of ant that produces its own food does so by gardening. These farmer ants take pieces of leaves into the colony and chew them up. The soft， ___28___ (chew) up leaves then sprout (涌出)a fungus that the worker ants use to feed the queen and young ants. There are many other ways that ants cooperate to maintain and protect their colonies.
There are also many other kinds of social insects. ___29___ makes them all so fascinating is their organization. ___30___ each insect has certain tasks to perform, the entire hive or colony appears to function as one living organism.
【答案】21. because
22. ones 23. are considered
24. to create
25. in 26. the
What is an insect? Insects of all kinds have existed on earth for millions of years. Sometimes we think of all insects as pests. Human life, however, would have a difficult time continuing without insects, ___21___ they pollinate plants and are a food source for many animals. Besides, insects, especially the social ___22___，are fascinating.
One very interesting and useful social insect is the honey bee. Bees ___23___ (consider) social insects because they live and work together. The bee lives in a beehive with other worker bees, and with the queen, who can lay thousands of eggs a day. The worker bees make wax used ___24___ (create) new cells inside the hive. Humans use this valuable beeswax ___25___ candles，cosmetics, expensive furniture polish, and other products. They also produce honey, a valuable food for humans (as well as for bees).
Another fascinating social insect is ___26___ ant. Many types of ants live in colonies underground. There thousands of them build and maintain their “city”. They also cooperate to provide food, sometimes in a manner that looks like human. For example, some ants actually raise their own food. One type of ant “farmer” keeps and cares for tiny insects that suck sweet sap (汁液)from plants. Ant farmers milk them from the sap, just like actual farmers milk cows. The sap is then given as food to young ants and to the queen, ___27___ main duty is to lay eggs. Another type of ant that produces its own food does so by gardening. These farmer ants take pieces of leaves into the colony and chew them up. The soft， ___28___ (chew) up leaves then sprout (涌出)a fungus that the worker ants use to feed the queen and young ants. There are many other ways that ants cooperate to maintain and protect their colonies.
There are also many other kinds of social insects. ___29___ makes them all so fascinating is their organization. ___30___ each insect has certain tasks to perform, the entire hive or colony appears to function as one living organism.
【答案】21. because
22. ones 23. are considered
24. to create
25. in 26. the
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