被马克思称为“贩卖人类血肉”的黑奴贸易之“三角贸易”的路线是[ ] A、欧洲—非

如图所示，小车质量M=8㎏，带电荷量q=+3×10^-2C，置于光滑水平面上，水平面上方存在方向水平向右的匀强电场，场强大小E=2×10²N/C．当小车向右的速度为v=3m/s时，将一个不带电、可视为质点的绝缘物块轻放在小车右端，物块质量m=1kg，物块与小车表面间动摩擦因数μ=0.2，小车足够长，g取10m/s²，求：

（1）物块在小车上滑动过程中系统因摩擦产生的内能．

（2）从滑块放在小车上后5s内电场力对小车所做的功．

男性，30岁，从事火车站搬运工作7年，1天前在搬运货物时突发腰部疼痛，活动受限，并伴有右小腿外侧放射痛，无大小便失禁。

患者应考虑诊断（）

A.腰椎肿瘤

B.腰椎结核

C.腰肌劳损

D.腰椎间盘突出症

E.第3腰椎横突综合症

Dad taught me a lot about life, especially its hard times. I remembered one of his ___21___ one night when I was ready to ___22___ a political campaign I was losing, and wrote about it in my diary.

Tired, feeling the months of ___23___ in vain, I went up to my study to make some notes. I was looking for a pencil in the back of my desk drawer ___24___ I turned up one of Dad’s old business cards that he was proud of: Andrea Cuomo Italian-American Groceries --- Fine Imported Products. Then I thought about how he ___25___ with difficult situations. A lot of pictures ___26___ into my mind, but one scene came sharply into ___27___.

We had just moved to Holliswood, New York. We had our own house for the first time; it had some land around it, even trees. One, ___28___, was a great blue spruce (云杉) that must have been 40 feet tall.

Less than a week after we moved in, there was a terrible storm. We came home from the store that night to find the spruce pulled almost ___29___ from the ground and thrown onto the street. When my brother Frankie and I saw the spruce, our hearts ___30___. But not Dad’s.

The rain was falling. Then he ___31___ , “Ok, we’re going to push him up!” “ What are you talking about, Dad? The ___32___ are out of the ground!” “ Shut up, we’re going to push him up, he’s going to grow again.” We couldn’t say ___33___ to him. So we ___34___ him into the house and got what rope ___35___ was and tied it around the top of the tree that lay on the street, and then he stood up by the house, ___36___ me pulling on the rope, and Frankie in the street in the rain, ___37___ to push up the great blue spruce. In no ___38___ at all, we had him standing up straight again! Dad ___39___ the stakes (桩) in the ground, tied the rope from the trunk to the stakes, and said, “ Don’t worry. He’s going to grow again…”

I looked at the card and wanted to cry. I ___40 ___ wait to get back into the campaign.

小题1:.

.

A．ideas

B．lessons

C．talks

D．conversations小题2:.

A．bury

B．attempt

C．trap

D．quit小题3:.

A．struggle

B．operation

C．performance

D．application小题4:.

A．as

B．before

C．while

D．when小题5:.

.

A．did

B．occupied

C．settled

D．dealt小题6:.

A．appeared

B．bumped

C．leapt

D．burst小题7:.

A．spot

B．view

C．scene

D．site小题8:.

.

A．in relief

B．in need

C．in particular

D．in all小题9:.

A．absolutely

B．accidentally

C．totally

D．automatically小题10:.

A．suffered

B．carved

C．sank

D．infected小题11:.

A．announced

B．challenged

C．barked

D．distributed小题12:.

A．trunks

B．roots

C．branches

D．leaves小题13:.

A．anything

B．no

C．nothing

D．something小题14:.

.

A．accompanied

B．hiked

C．joined

D．followed小题15:.

A．it

B．that

C．there

D．this小题16:.

A．along

B．via

C．by

D．with小题17:.

A．to help

B．helped

C．helping

D．help小题18:.

.

A．problem

B．time

C．way

D．means小题19:.

A．drove

B．removed

C．delivered

D．dragged小题20:.

A．needn’t

B．wouldn’t

C．shouldn’t

D．couldn’t

亚里士多德主张文艺模仿的对象是（）。

A、自然现象

B、人的精神生活

C、感觉世界

D、数的和谐

在串级调节系统中，主变量控制质量要求高、副变量要求不高时，主、副调节器的调节规律应分别选择（）。

A、PI、PI

B、PID（或PI）、P

C、PI、P

D、P、PI