患者男性，25岁，1个月前出现左睾丸疼痛，并可触及左侧睾丸肿块约2cm×1cm×2c

男，45岁，腰痛伴右下肢放射痛加重3天，体检：下腰椎旁压痛，右直腿抬高试验50°，加强试验（+），右足背外侧皮肤感觉麻木，右足跖屈肌力减弱，踝反射消失，拟为腰椎间盘突出。

其压迫的是哪根神经根（）

A.腰₃神经根

B.腰₄神经根

C.腰₅神经根

D.骶₁神经根

E.骶₂神经根

短周期主族元素A、B、C的原子序数依次递增，它们的族序数之和为11，A、C同主族，B原子最外层电子数比A原子次外层电子数多l。下列叙述正确的是（   ）

A．物质熔点的高低可能有如下关系：化合物CA> C的单质> A的某种单质

B．A、C两元素的最高价氧化物对应水化物的酸性A弱于C

C．B和C的最高价氧化物均既能与强酸反应，又能与强碱反应

D．A能够将C从其氧化物中还原出来

阅读理解。

     If I were writing a history of my family, some of the darkest moments recorded would be those about

Christmas trees. One would certainly think otherwise; selecting and putting up our trees have always been

filled with risk. For example, one afternoon dangerously close to Christmas Eve my mother bought what

she thought to be a bargain, a glorious tree that was so full and tall that we could hardly get it into the house.

Once we did, my father immediately realized that we would have to hire a carpenter (木匠) to build a stand

for it. Another December, perhaps the very next one, we bought a tree earlier than we ever had before. We

were happy with its shape and delighted that its size was manageable. We easily placed it in a stand, decorated

(装饰) it from top to bottom, and then self-satisfiedly sat back by the fire in its soft light. Two or three days

passed and the truth could not be hidden; we had bought a tree cut so long ago that its needles were coming

off. There was nothing to do but undecorate it, take it down, and begin tree shopping again. Our most recent

Christmas tree offered still another difficult task. When we brought it home, once again it seemed larger than

it was in the great outdoors. To complicate matters, we had bought a new stand, one whose nuts (螺帽) and

bolts (闩子) worked more mysteriously than those of our old stands. I persuaded two young neighbors to stop

playing basketball and to help us get the tree into the house and set it correctly in the stand. Unfortunately, no

one noticed the mud on our helpers' shoes, so only after removing several reddish brown spots from the carpet

were we able to discuss the question of where the lights and ornaments (装饰物) were stored. Perhaps those

who cut their own trees have tales more painful than these. I don't care to hear them, as my family's

experiences are enough to cause me to make the following suggestion:"Let's forget the tree next Christmas.

Let's simply hang some flowers on the front door and over the mirror in the hall."

1. The darkest moments in the writer's family were with the fact that _____.

A. the family bought big Christmas trees

B. they had problems decorating their Christmas trees

C. they had problems picking suitable Christmas trees

D. they had problems finding carpenters for putting up Christmas trees

2. We can learn from the passage that the writer would like to _____.

A. forget about Christmas stories

B. get the neighbors to put up their trees

C. buy a better tree to celebrate Christmas

D. make other decorations rather than Christmas trees

3. When the writer said "my mother bought what she thought to be a bargain", he means _____.

A. she bought the tree at a cheap price

B. she didn't really want to buy it

C. she had to bargain hard with the salesman

D. she couldn't afford a more expensive one

4. Which of the following can be the best title for the passage?

A. How to Choose a Christmas Tree

B. No More Christmas Tree for Us

C. Dark Moments of Life

D. Christmas Without Trees

下列不属于慢性铅中毒主要临床表现的是（）。

A.类神经症

B.贫血

C.易兴奋症

D.腕下垂

E.腹绞痛