题目内容

Throughout history, man has had to accept the fact that all living things must die, but people now live longer than they used to. Yet, all【C1】things still show the effect of aging, which will eventually【C2】death. The body and the【C3】, they do not function as well as they【C4】in childhood and adolescence(青春期). The body provides less【C5】against disease and is more prone(易于……的)【C6】accident.
A number of related causes may【C7】to aging. Some cells of the body have a【C8】long life, but they are not【C9】when they die. As a person ages,【C10】of brain cells and muscle cells decreases. Other body cells did and are replaced by new cells. In an aging person the【C11】cells may not be as viable(能生存的)or as capable【C12】growth as those of a young person.
Another factor in aging may be changes within the cells【C13】. Some of the protein chemicals in cells【C14】known to change【C15】age and become less elastic. This is why the skin of old people wrinkles and hangs loose. This is also the reason old people shrink in【C16】. There may be other more important chemical changes in the cells. Some complex cell chemicals.【C17】DNA and RNA, store and【C18】information that the cells need. Aging may【C19】this process and change the information carrying molecules【C20】they do not transmit the information as well.
【C1】

A. living
B. alive
C. lively
D. lovely

查看答案

搜索结果不匹配？点我反馈

更多问题

A．Deposit some money in a bank.B．Read the lease carefully and sign it.C．Ask the landlo

A. Deposit some money in a bank.
B. Read the lease carefully and sign it.
C. Ask the landlord for a damage deposit.
D. Sign the contract and pay a security deposit.

查看答案

听力原文：M: You wouldn't believe the line at the auto inspection center. I waited more than two hours to get through it.
W: That's what you get for waiting until the last day of the month.
Q: what does the woman imply？
(19)

A. She had to wait even longer than the man did to have her car inspected.
B. The man should have had his car inspected earlier.
C. The auto inspection center will be closed at the end of the month.
D. The man doesn't need to have his car inspected until next month.

查看答案

W: Sorry, we weren't exactly on good terms when she left.
Q: What does the woman imply？
(15)

A. She lost Sally's new address.
B. Sally had to move unexpectedly.
C. She'll be glad to take the mail to Sally's house.
D. She's no longer in contact with Sally.

查看答案

M: Don't you have anything better to do？
Q: What does the man mean？
(13)

A. The man should watch a different program.
B. She'd like to watch television with the man.
C. The man shouldn't waste his time watching television.
D. The television program doesn't start until later in the evening.

查看答案

A. living B. alive C. lively D. lovely

A．Deposit some money in a bank.B．Read the lease carefully and sign it.C．Ask the landlo

听力原文：M: You wouldn't believe the line at the auto inspection center. I waited more than two hours to get through it.W: That's what you get for waiting until the last day of the month.Q: what does the woman imply？(19)

W: Sorry, we weren't exactly on good terms when she left.Q: What does the woman imply？(15)

M: Don't you have anything better to do？Q: What does the man mean？(13)

A. living
B. alive
C. lively
D. lovely

听力原文：M: You wouldn't believe the line at the auto inspection center. I waited more than two hours to get through it.
W: That's what you get for waiting until the last day of the month.
Q: what does the woman imply？
(19)

W: Sorry, we weren't exactly on good terms when she left.
Q: What does the woman imply？
(15)

M: Don't you have anything better to do？
Q: What does the man mean？
(13)