—Look at your hands, John. ______ of them is clean.
—OK, I’ll wash them at once.
A．Neither B．None C．Both D．Either
九年级英语单项填空中等难度题
—Look at your hands, John. ______ of them is clean.
—OK, I’ll wash them at once.
A．Neither B．None C．Both D．Either
九年级英语单项填空中等难度题查看答案及解析
Look closely at your hands. Are they clean? It doesn't matter how many times you wash your hands, tiny microbes (微生物) still stay on them. But don't worry. Most microbes don't harm you.
Now scientists say the microbes on our hands could be used in a surprising way; fighting crime, According to a recent survey microbes as well as fingerprints(指纹) could be used to indentify the criminal.
Everyone has his own set of microbes on the hands. That is to say, if you and your best friend were able to see and compare all the microbes on your hands, your hands probably would look different. Some microbes only show up on your hands while others live only on your friend's hands.
When you work on a computer you leave the microbes from your hands on the keyboard. The scientists can easily tell the owner of the keyboard by looking at the microbes on it. Even if you don't leave your fingerprints behind, your microbes may give you away.
Noah Fierer, a scientist, says. "You can only clean a fingerprint, but you can't sterilize (使无菌) a surface just by wiping(擦) it off," He says that scientists have a lot more work to do before the microbe is used as a useful tool.
1.According to the passage,_______ could be used to identify the criminal.
A. fingerprints B. scientists' hands
C. microbes D. fingerprints and microbes on people's hands
2.Paragraph 3 tells us that________.
A. our hands look similar B. the microbes will make the keyboard dirty.
C. we should compare hands often D. we have our own sets of microbes.
3.When you work on computer, the microbes________.
A. just stay on our hands B. also stay on the keyboard
C. will do harm to you D. will disappear
4.From Noah Fierer we know that________.
A. fingerprints are no longer useful in fighting crime
B. microbes can be found on everyone's hands.
C. unlike microbe fingerprints can be cleaned if people wipe them
D. the microbe is used as a useful tool
5.What’s the best title of the passage?
A. Microbes May Tell Who You Are B. Scientists Say Everyone Has Microbes
C. Noah Fiercer Does Research Into Microbes D. Fingerprints Help Catch Criminals
九年级英语阅读理解中等难度题查看答案及解析
Please ________ at once after all of you have finished your homework.
A. hand them out B. hand them in C. hand it in D. hand it out
九年级英语单项填空中等难度题查看答案及解析
（题文）—John, your room is really in a mess.It needs________.
—Sorry, Mum.I'll do it at once.
A. cleans B. cleaned C. to clean D. to be cleaned
九年级英语单选题简单题查看答案及解析
—John, your room is really in a mess.It needs________.
—Sorry, Mum.I'll do it at once.
A. cleans B. cleaned C. to clean D. to be cleaned
九年级英语单选题简单题查看答案及解析
—Look! Lily and Sally are cleaning the school laboratory.
—Let’s go and join them. .
A. Many hands make light work
B. The early bird catches the worm
C. A friend in need is a friend indeed
D. The grass is always greener on the other side
九年级英语单项填空中等难度题查看答案及解析
—You see, ______ Sandy ______ Simon is good at color therapy!
—OK! Then I can ask either of them for advice.
A. Both; and B. Either; or
C. Not only; but D. Neither; nor
九年级英语单项填空中等难度题查看答案及解析
Look at your dirty hands. You should go and wash your hands ________ you have lunch.
A. after B. before
C. while D. although
九年级英语单选题中等难度题查看答案及解析
John, your room is really in a mess. It needs________.
A.cleans B.cleaned C.to clean D.to be cleaned
九年级英语单选题困难题查看答案及解析
When Bob is upset or tired, he prefers comedies that can____.
A.look it up
B.clean them up
C.cheer him up
九年级英语单项填空简单题查看答案及解析