— Do you know ______? I can’t find them.— Yes...

— Do you know ______?  I  can’t find them.

— Yes. They are on the table in the kitchen.

A. Where she puts my glasses                   B. Where does she put my glasses

C. Where she put my glasses                    D. Where my glasses was

九年级英语单项填空中等难度题查看答案及解析

— Where are my glasses，dear grandson？

— Haha，Granny，can’t you find them？They’re 　　　 on your nose．

A.almost B.right C.only D.even

九年级英语单选题简单题查看答案及解析

--Do you know the boys_______ playing football on the playground?

--Yes,They are all from Class 1.

A. who are

B. who is

C. that is

九年级英语单项填空困难题查看答案及解析

---Do you know_______ the books on the shelves?

--- Sorry, I can’t count them, because there are _______books.

A. a number of; the number of

B. a number of; a number

C. the number of; a number of

九年级英语单项填空中等难度题查看答案及解析

--Do you know_______ the books on the shelves?

--- Sorry, I can’t count them, because there are _______books.

A. a number of; the number of　　　 B. a number of; a number

C. the number of; a number of　　　 D. the number of ,a number

九年级英语单项填空中等难度题查看答案及解析

-Do you know the girls who are in the living room?

-Yes, they are my classmates. They are celebrating Lucy's _　　　　 birthday.

A .thirteen　　　 B. the thirteenth　　　　 C. thirteenth

九年级英语单项填空中等难度题查看答案及解析

—Look. Here are two apples. Are they for me?

—Yes. You can have ____of them. The other one is for your little brother.

A. both　　 B. all　　 C. either

九年级英语单选题中等难度题查看答案及解析

----Do you live alone, Mr. Wang?

---Yes. I have two children. But _　 of them lives with me. They are now studying in England.

A. either　　 B. both　　 C. neither　　 D. all

九年级英语单选题中等难度题查看答案及解析

Do you know viruses (病毒) and bacteria (细菌)? Both of them are very small, we can't see them with our eyes, and many people know nothing about them, In fact, there are a number of differences between viruses and bacteria. Bacterium, the singular form of the word bacteria, is a one-celled (单细胞) living thing, with complete sets of both RNA and DNA genetic codes (遗传密码). For viruses, some are sections of RNA, and the others are sections of DNA. So, bacterium is at least a hundred times larger than a typical virus.

One main difference between viruses and bacteria is the method of reproduction. A bacterium is a completely independent and self-reproducing unit. When the time is right, bacterium will divide its DNA and RNA genetic material in two. This is how bacteria live in almost every environment on Earth, including non-living things like rocks or plastic.

A virus, on the other hand, cannot reproduce without a living host. A virus may lie for thousands of years before finally coming into a suitable host. Once it enters the body of a host, a virus will get in the ling cell. Once inside a living cell, a virus takes the place of the living cell's DNA or RNA genetic instructions with its own. Those instructions are usually to make as many copies of the virus as possible.

Ninety-nine percent of all known bacteria are considered useful to humans, or at least have no bad influence. But most viruses, on the other hand, serve no good purpose. Their only purpose is to create more viruses in order to make themselves continue to live.

Bacteria are alive, which means they can be killed by some form of chemical things. Antibiotics (抗生素) can kill bacteria. Viruses, by comparison, are not considered living things. They cannot be 'killed' in the same way as antibiotics kill bacteria. In fact, any medicine is useless for virus' infections. The disease must run its course until the body can make a successful protection on its own.

九年级英语填空中等难度题查看答案及解析

---Do you know these　　　　　　　　 over there? They're so handsome.

---Yes, they are my friends.

A. policemans　　　　　　　 B. Canadas

C. postmans　　　　　　　　 D. heroes

九年级英语单项填空中等难度题查看答案及解析