如图所示，小明同学坐在过山车里，过山车高速运动时，小明看到地面上的建筑物在旋转。

Malthusian fears that population growth will outstrip food supplies have been widely discounted as food production has kept well ahead of growing human numbers in the last half century. While population doubled, food supply tripled, and life expectancy increased from 46 in the 1950s to around 65 today. But more recently, some experts have once again been sounding the alarm about a possible food crisis.

The reason lies in the combined impact of many factors including climate change, forest denudation, land degradation, water shortage, declining oil supplies, species extinction, destruction of coastal ecosystems and the growing demands for a meat-rich diet from newly developed parts of the world.

At the root of all these problems has been the ruthless exploitation of the earth’s resources, fuelled by growing affluence in some parts of the world and desperate poverty in others. Between 1980 and 2000, global population rose from 4.4 billion to 6.1 billion, while food production increased 50 per cent. By 2050, the population is expected to reach 9 billion.

Data shows that while grain yields per acre have been increasing, the rate of increase has been slowing since the days of the Green Revolution in the 1970s. Most of the benefits of irrigation, machinery, fertilizer and plant breeding have already been realized. The production of grain per acre is close to the maximum obtainable through photosynthesis.

To keep up with the growth in human population, more food will have to be produced over the next 50 years than has been during the past 10,000 years combined, said the participants of the recent UN-backed forum in Iceland on sustainable development. It is, of course, possible that new technologies, smart environmental management and sensitive social policies will combine to good effect to usher in a new green revolution. But as grain reserves have fallen to their lowest level for many years, this cannot be guaranteed.

At the 1996 World Food Summit political leaders from 186 countries pledged to halve the number of hungry people in the world by the year 2015, or a reduction of 20 million each year. At that time, about 800 million people were reported to suffer from under- nourishment. In 2007 estimates from the UN Food and Agriculture Organization (FAO) suggest that there are 854 million people who do not get enough to eat every day. "Far from decreasing, the number of hungry people in the world is currently increasing," said FAO Director-General Jacques Diouf. (Of course, world population has increased by some 800 million in that time, so food supplies have kept up relatively well, but have failed to reach an increasing number, let alone reduce the total going hungry.)

From the passage, it can be inferred that a new green revolution（）

A. will increase grain output per acre

B. will bring about new changes

C. can wipe out the environmental pollution

D. may not be very promising

保守秘密是保险核保人员应该遵守的职业道德。保险核保人员保守秘密的具体内容包括()：①对所获知的保户信息尽保密责任;②严格保守客户的个人隐私;③任何情况下都不可以披露客户的个人信息;④某些情况下可以披露客户的个人信息。

A.①②③④

B.①②③

C.①②④

D.②③④

中风眩晕等病是因何病理结果引起痴呆

A．脑髓失养

B．痰浊内生

C．脾肾两虚

D．脑脉痹阻

E．心气不足

如何理解实事求是证据制度的创立于发展？

患者男性，26岁，因腿部被生锈的铁钉刺伤在家自行消毒，未注射TAT，1周后突然出现全身肌肉强直性收缩，阵发性痉挛，诊断为破伤风。

与控制痉挛无关的护理措施是

A．保持病室安静
B．护理措施要集中进行
C．按时使用镇静剂
D．避免损伤
E．避免强光照射