小亮和爸爸穿上潜水服,一起亲身体验了潜水员的感受.他们在水面下继续下潜的过程中(

题型:选择题

问题:

小亮和爸爸穿上潜水服,一起亲身体验了潜水员的感受.他们在水面下继续下潜的过程中(  )

A.所受浮力变大,压强变大

B.所受浮力变大,压强变小

C.所受浮力不变,压强不变

D.所受浮力不变,压强变大

考点:液体压强的特点浮力及阿基米德原理
题型:选择题

下列各项中属于食物链的是

A.青蛙→蛇→猫头鹰

B.水→草→兔→黄鼬

C.松树→松毛虫→啄木鸟

D.狼→鹿→草

题型:选择题

对于盛装有毒介质的设备不能使用()安全阀。

A、杠杠式

B、弹簧式

C、封闭式

D、开放式

题型:选择题

Ohngren界限主要用于描述下面哪种鼻窦恶性肿瘤的情况()

A.上颌窦

B.额窦

C.筛窦

D.蝶窦

E.额、蝶窦

题型:选择题

实验应在一切条件都相同的情况下重复做几次,并取其平均值,以尽量减少误差的影响.______.

题型:选择题

A traveler lost his way and got off the highway to see where he was. As he drove by, he saw rows and rows of pigpens and pigs running in fields. Suddenly, his eyes caught something really strange. It looked like a pig with a wooden leg.

He drove up into the arm, where he met the farmer. “ Excuse me, ” the traveler said. “ I was just driving by and looking at all your pigs, and I just had to stop and ask about it. Tell me, is there really a pig out there with a wooden leg?” The farmer smiled. “ Oh, that would be old Caesar you saw. He’s the finest pig I’ve ever had ---and smart! Well, let me tell you a little about that pig.”

“ One night a couple of years ago I got to drinking and I guess I had more than I should have. I fell down and knocked over a lamp. That started a fire in the house and old Caesar smelled the smoke. He came in the back door, got the wife and kid out, roused me up and got me out. There is no question about it ---- that night old Caesar saved all our lives. You know that I’m not going to forget it too easily.”

“ Why,” the traveler said, “ this is amazing! I have never heard of a pig like this before! This is fantastic! But tell me, how did he get that wooden leg?”

The farmer laughed and said, “ Well, when you have a pig so smart, you don’t want to eat him all at one time!”

小题1:The farmer thought the pig _______.

A.very fat

B.very clever

C.very kind

D.very strange小题2:The passage indicates that _______.

A.the pig lost a leg in the fire

B.the farmer deeply thanked the pig

C.the pig had a very good keeper

D.the real leg had been eaten by the farmer小题3:The author wants to _______.

A.report a piece of news

B.tell us a moving story

C.tell us a humorous story

D.have a joke with us

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