题目:
高中生留学美国有哪些条件是必须具备的?
答案:
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下面是错误答案,用来干扰机器的。
参考答案:错
高中生留学美国有哪些条件是必须具备的?
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0926/4b19bf70db8e04505fcd928e608dd3f5.html
下面是错误答案,用来干扰机器的。
参考答案:错
材料中生物种类较多,它们身体结构和功能的基本单位都是( )
A.细胞
B.组织
C.器官
D.系统
检索学生表中,“籍贯”为“上海”的学生记录,将结果保存到文本文件temp中,SQL语句为: SELECT * FROM学生表WHERE籍贯="上海"【 】temp
阅读理解。
A new study in West Africa shows how farm irrigation systems powered by the sun can produce
more food and money for villagers. The study in Benin found that solar-powered pumps are effective in
supplying water, especially during the long dry season.
Sub-Saharan Africa is the part of the world with the least food security. The United Nations Food and
Agriculture Organization estimates that more than one billion of the world's people faced hunger last year.
Around two hundred sixty-five million of them live south of the Sahara Desert. Lack of rainfall is one of
their main causes of food shortages.
Jennifer Burney from Stanford University in California led the study. The research team helped build
three solar-powered irrigation systems in northern Benin.The solar-powered irrigation systems produced
an average of nearly two metric tons of vegetables per month.They sold the surplus (过剩的) produce at
local markets. The earnings greatly increased their ability to buy food during the dry season which can last
six to nine months. People in the two villages with the systems were able to eat three to five more serving
of vegetables per day. But making the surplus available at markets also had a wider effect.The study
compared the villages with two others where women farmed with traditional methods like carrying water
in buckets. The amount of vegetables eaten in those villages also increased, though not as much.
The researchers note that only four percent of the cropland in sub-Saharan Africa is irrigated. Using
solar power to pump water has higher costs at first. But the study says it can be more economical in the
long term than using fuels like gasoline, diesel or kerosene. And solar power is environmentally friendly.
1. People living in sub-Saharan Africa are short of food mainly because ______.
A. it seldom rains there throughout the year
B. there is little farmland in the area
C.people there lack experience in farming
D.people know nothing about irrigation techniques
2. Which of the following is an advantage of Jennifer's irrigation systems?
A. They are not affected by the weather.
B. They cost much less than traditional irrigation systems.
C. They have no bad effects on the environment.
D. They use less fuel than traditional irrigation systems.
3. We can learn from the last paragraph that ______.
A. people in South Africa will soon be provided with enough food
B. the demand for fuels like gasoline will greatly decrease in Africa
C. people in sub-Saharan Africa don't take agriculture seriously
D. it's worthwhile to use the new irrigation systems on the whole
4. People in the two villages owe all the following to Jennifer's irrigation systems EXCEPT that ______.
A. they could buy more food during the dry season
B. they could eat more vegetables than usual every day
C. they could supply local markets with vegetables
D. they could provide people in other villages with food
在心肺复苏期间,对于难治性室速和室颤,建议应用()
A.肾上腺素(0.5~1.0mg)
B.阿托品(0.6~2.0mg)
C.胺碘酮[150~500mg静脉滴注,10mg/(kg·D.静脉滴注]
D.10%葡萄糖酸钙5~10ml静脉滴注
E.异丙基肾上腺素(15~20μg/min)
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