2. What is the main idea of the third paragraph？
A. Children are more likely to be attacked.
B. The reasons for dog bites.
C. Dog bits are on the rise.
D. Views of experts.
3. Which of the following is NOT correct according to the passage？
A. Some 4.7 million people were bitten by dogs in Atlanta.
B. Some countries dont collect the data about dog bites at all.
C. Larger， more powerful dogs are on the causes to more dog bites.
D. The CDC thinks dog bites a serious public health problem for children.
4. Which of the following is the best title of the passage？
A. Dont Be One of Them
B. Dog Bites on the Rise
C. How to Protect Yourself and Your Children
D. Dangerous to Keep Pets
完形填空
Passage D
Throughout history man has had to accept the fact that all living things must die①. Although people now live longer than they used to， yet all living things still show the1of aging， which will finally2 in death.
Aging is not a3， but as a person passes maturity （成熟）， the cells of the body and organs they4 dont work as well as they5 in childhood and youth. The body provides less6 against disease and is more prone （有……倾向的） to7 .
A number of related causes may8 to aging. Some cells of the body have a fairly long life， but they are not9 when they die. As a person ages， the10 of brain cells and muscle cells decrease.11 body cells die and are replaced by new cells. In an aging person the12 cells may not be as active or as capable13 growth as those of a young person.
Another factor14 may be changes within the cells15. Some of the protein chemicals in cells are known to16 with age and become less elastic （有弹性的）. This is why the skin of old people wrinkles （起皱纹） and hangs17. This is also the reason why old people shrink （萎缩） in18 . There may be other more important chemical changes in the cells②. Some complex cell chemicals， such as DNA and RNA， store and19 information that the cells need. Aging may20 this process and change the information carrying molecules （分子） so that they do not pass on the information as well.
译注
①Throughout history man has had to accept the fact that all living things must die.
在整个历史上，人类都不得不接受所有生物都要死亡这一事实。
③ There may be other more important chemical changes in the cells.
在细胞内，可能还有其他更为重要的化学变化。
根据文章内容，选择正确答案：
1.A. periods
B. effect
C. habits
D. instruction
2. A. give
B. bring
C. run
D. result
3. A. disease
B. disaster
C. disability D. rest
4. A. become
B. grow
C. carry
D. form
5. A. did
B. made
C. used
D. served
6. A. energy
B. protection
C. heat
D. material
7. A. accidents
B. development
C. achievements
D. improvement
8. A. intend
B. lead
C. attempt
D. devote
9. A. replaced
B. reborn
C. recovered
D. made
10.A. action
B. amount
C. number
D. move
11.A. Some
B. Any
C. Another
D. Other
12.A. old
B. left
C. new
D. remaining
13.A. to
B. for
C. of D. in
14.A. aging
B. youth
C. life
D. death
15.A. for themselves
B. of themselves
C. themselves
D. on their own
16.A. change B. slow
C. produce
D. lose
17.A. loosely
B. tightly
C. lightly
D. heavily
18.A. weight
B. height
C. shape
D. age
19.A. pass away
B. pass by
C. pass off
D. pass on
20.A. worsen
B. push
C. quicken
D.affect
答案
Passage A
本文是说明文，主要向读者介绍如何进行人工呼吸。
1.D. 本题为标题考查题。选择的标题一定要紧扣整篇文章，本文主要向读者介绍了如何进行人工呼吸，因此答案选择D。
