选拔领导人才是领导者做好用人工作的重中之重。( )

如图5所示，用一小车通过轻绳提升一货物，某一时刻，两段绳恰好垂直，且拴在小车一端的绳与水平方向的夹角为，此时小车的速度为，则此时货物的速度为

A．

B．sin

C．cos

D．

秦始皇陵铜车马、青铜仙鹤、树下仕女图等10件顶级国宝，聚首“2011西安世园会”。

(1)秦始皇陵铜车马出土时表面有一些铜锈，铜锈主要成分是碱式碳酸铜[Cu₂ (OH)₂CO₃]。铜生锈除了与氧气和水有关外，从碱式碳酸铜的化学式推知还与空气中的____有关。    

(2)青铜仙鹤的主要成分是铜合金。一般来说，合金与组成它的纯金属相比，其性能会发生改变，改变之一是_______。

阅读理解。

     A new study indicates that combining aerobics (有氧运动) and weight lifting can help people with Type 2

diabetes (糖尿病) keep their blood sugar levels under control.

     Most people probably think of diabetes control in terms of diet or insulin (胰岛素), but Dr. Tim Church

says exercise can play a big role.

     "If you look at what diabetes is, it's the failure of the body to manage the blood sugar, and the biggest

consumer of blood sugar in the human body is skeletal (骨骼) muscle," he says." So if you keep skeletal

muscle happy, it's chewing up blood sugar 24 hours a day."

     Church says most previous studies looked at the impact on diabetes of one kind of exercise only-typically

aerobic exercise, like walking or bicycling. So he and his colleagues recruited (招募) more than 250 patients

with diabetes and randomly assigned them to an aerobic exercise group, a weightlifting group, a group that did

both kinds of exercise, or a control group that had no organized exercise program.

     After nine months, he said, the results were clear.

     "And for everything we looked at, but in particu1ar related to hemoglobin (血红蛋白) A1C-that represents

blood sugar control-the group that did both the walking and the resistance training, or weight lifting, did by far

the best."

     Church said he expected that the group that did both kinds of exercise would do better, but he was

surprised by how much better they did-not just on controlling blood sugar, but on other relevant measures as

well, like weight. He said different kinds of exercise affect the body differently, especially the big muscles that

are fueled by blood sugar.

     "Skeletal muscle is so important for your health, and that's particularly true in individuals with diabetes," he

explained."And aerobic exercise affects skeletal muscle through one set of mechanisms(机制), and the

weight-lifting affects skeletal muscles through a completely different set of mechanisms. So when you

combine aerobic plus the weight-lifting, you're doubling the opportunity for benefit."

1. Which of the following is true of diabetes?

A. The body fails to manage the blood sugar.

B. It can be controlled only through diet or insulin.

C. Skeletal muscles can't consume blood sugar.

D. People with type 2 diabetes are too fat.

2. Dr.Church was surprised that _____.

A. the group doing both kinds of exercise just controlled blood sugar

B. his colleagues recruited so many people in his experiment

C. the result of his experiment was far beyond his expectation

D. the group doing both kinds of exercise just controlled weight

3. What does the underlined phrase "the resistance training" refer to?

A. aerobics

B. walking

C. bicycling

D. weight-lifting

4. According to the text, we can learn that _____.

A. all the experiment groups have an organized exercise program

B. different kinds of exercise affect the body the same way

C. skeletal muscles are important only for individuals with diabetes

D. aerobics and weight-lifting affect skeletal muscles in a different way

5. The text is most probably a _____.

A. science fiction story

B. science health report

C. newspaper advertisement

D. book review

心力衰竭患者水肿通常首先出现在

A．眼睑

B．双手

C．颜面

D．身体最低部位

E．腹部

围护结构的传热方式包括（）

A.导热

B.对流

C.辐射

D.吸热