Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Fill in the appropriate word in question 41

            Our family has got many books. All the …(33)……… of our family buy books and read them. My mother says that books help us in self-education. In ancient times, books ……(34)…… written by hand. It was difficult to write a book …(35)……… a pen. Then printing came into our life. Printing played an important ……(36)…. in the development of literature and culture. Now there are a lot of books in the shops, there are many books in our flats. But it is difficult to buy all books …(37)……… we want to read. That’s why we get books in public libraries. There are some problems in our life and sometimes it is difficult to ……(38)… them. I think that books can help us. Last year I read a very interesting book “ An American Tragedy” by Theodore Dreiser.

            This novel was …(39)…… at the beginning of the 20^th century. The novel ……(40)……. The tragic fate of a boy and a girl, Clyde and Roberta ……(41)…… name. It is a sad story. This novel was written many years ago, but it is …(42)……… nowadays. Books must be our friends during our life.

A. on

B. by

C. of 

D. with

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

        The cause of tooth decay is acid, which is produced by bacteria in the mouth. The acid removes minerals from tooth enamel, allowing tooth decay to begin; the saliva in your mouth encourages remineralization and neutralizes the acid. The rate at which bacteria in the mouth produce acid depends on the amount of plaque on the teeth, the composition of the microbial flora, and whether the bacteria of the plaque have been "primed" by frequent exposure to sugar. To keep your teeth healthy, a regular dental hygiene program should be followed.
        Removing plaque with a toothbrush and dental floss temporarily reduces the numbers of bacteria in the mouth and thus reduces tooth decay. It also makes the surfaces of the teeth more accessible, enabling saliva to neutralize acid and remineralize lesions. If fluoride is present in drinking water when teeth are forming, some fluoride is incorporated into the enamel of the teeth, making them more resistant to attack by acid. Fluoride toothpaste seems to act in another way, by promoting the remineralization of early carious lesions.
In addition to a regular dental hygiene program, a good way to keep your teeth healthy is to reduce your intake of sweet food. The least cavity-causing way to eat sweets is to have them with meals and not between. The number of times you eat sweets rather than the total amount determines how much harmful acid the bacteria in your saliva produce. But the amount of sweets influences the quality of your saliva. Avoid, if you can, sticky sweets that stay in your mouth a long time. Also try to brush and floss your teeth after eating sugary foods. Even rinsing your mouth with water is effective. Whenever possible, eat foods with fiber, such as raw carrot sticks, apples, celery sticks, etc., that scrape off plaque, acting as a toothbrush. Cavities can be greatly reduced if these rules are followed when eating sweets.

The word "scrape off" is closest in meaning to

A. repel      

B. rub together with        

C. remove   

D. dissolve