2005年东中西部人均国内生产总值分别为24905元、11930元、（）元。 A.7

1，2，9，121，( )

A．251

B．441

C．16900

D．960

视频所示为运输过程中的什么过程( )

A．中转过程

B．到货签单

C．卸货过程

D．验货过程

(A)

Around the world more people are taking part in dangerous sports and activities. Now, there are people who look for an immediate excitement from a risky activity which may only last a few minutes or even seconds.

I would consider bungee jumping (蹦极) to be a good example of such an activity. You jump from a high place 200 meters above the ground with an elastic (弹性的) rope tied to your feet. You fall at up to 150 kilometers an hour until the rope stops you from hitting the ground. It is said that about 2 million people around the world have now tried bungee jumping. Other activities which most people would say are as risky as bungee jumping include jumping from tall buildings and diving into the sea from the top of high cliffs.

Why do people take part in such activities as these Some psychologists suggest that it is because life in modem societies has become safe and boring. Not very 10ng ago, people’s lives were constantly in danger. They had to go out and hunt for food, diseases could not easily be cured, and life was a continuous battle for survival.

Nowadays, according to many people, life offers little excitement. They live and work in quite safe conditions: they buy food in shops, and there are doctors and hospitals to look after them if they become ill. The answer for some of these people is to look for danger in activities such as bungee jumping.

The writer of the passage has a （） attitude towards dangerous sports.

A. positive

B. negative

C. neutral

D. critical

有关胎盘描述哪项不正确

A．妊娠12周基本形成
B．直径为18～20cm
C．胎盘重600～1000g
D．由18～20个胎盘小叶组成
E．母面暗红而粗糙

考虑到环境辐射热和“（）”产生的焦耳热对导线物理性能的影响，计算最高温度一般取为大气最高气温的（）倍。高速铁路接触网系统按最高工作温度（）设计，按（）校验。