当前位置:首页 > 学历类

[单项选择]

Passage Three All the useful energy at the surface of the earth comes from the activity of the sun. The sun heats and feeds mankind. Each year it provides men with two hundred million tons of grain and nearly ten million tons of wood. Coal, oil, natural gas, and all other fuels are stored-up energy from the sun. Some was collect ed by this season’s plants as carbon compounds. Some was stored by plants and trees ages ago. Even waterpower derives from the sun. Water turned into vapor by the sun falls as rain. It courses down the mountains and is converted to electric power. Light transmits only the energy that comes from the sun’ s outer layers, and much of this energy that is directed toward the earth never arrives. About nine-tenths of it is absorbed by the atmosphere of the earth. In fact; the earth itself gets only one half-billionth of the sun’ s entire output of radiant energy.

All the useful energy at the surface of the earth comes ()
A. directly from the sun
B. from the sun' s activity
C. from energy stored by the sun
D. from radiation of the sun

参考答案:

您可能感兴趣的题目:

[单项选择]治疗慢性粒细胞白血病热毒壅盛证,应首选
A. 膈下逐瘀汤
B. 青蒿鳖甲汤
C. 八珍汤
D. 清营汤合犀角地黄汤
E. 沙参麦冬汤
[单项选择]

30岁,男性,因发热、右侧胸痛、咳嗽3天入院。3天来每日体温最低为39.2℃,最高39.8℃。入院后查体:T39.5℃,右锁骨下可闻及支气管呼吸音。

该患者右上肺叩诊音可能出现()
A. 清音
B. 浊音
C. 实音
D. 鼓音
E. 过清音
[单项选择]强化企业管理,提高科学管理水平是现代化企业制度的内在要求,是国有企业扭亏为盈,提高竞争的有效途径。这说明了()。
A. 市场经济必然会有优胜劣汰
B. 加强管理可以有效地发挥资源的效能,从而提高企业的经济效益
C. 企业是市场经济的主体
D. 管理需要先进的管理技术手段
[单项选择]下列能引起外阴瘙痒的疾病有
A. 贫血
B. 滴虫性阴道病
C. 白血病
D. 糖尿病
E. 细菌性阴道病
[单项选择]贸易顺差是( )
A. 商品进口额大于出口额
B. 商品出口额大于商品进口额
C. 国际收入大于国际支出
D. 某种商品的进口大于出口
[单项选择]患者就诊妇科,除一般查体外应进行:
A. B超
B. 血尿常规化验
C. 盆腔检查
D. 激素水平测定
E. 肿瘤标记物检测
[单项选择]Jack was about to announce our plan but I ______.
A. put him through
B. cut him short
C. turned him out
D. gave him up
[单项选择]《招标投标法》规定,投标人有以下行为时,招标人可视其为严重违约而没收投标保证金。( )
A. 通过资格预审不投标
B. 不参加开标
C. 中标后拒绝签订合同
D. 不参加现场考察
[单项选择]下列关于数据元素的叙述中,不正确的是()。
A. 数据元素是数据的基本单位,即数据集合中的个体
B. 数据元素是有独立含义的数据最小单位
C. 数据元素又称作结点
D. 数据元素又称作记录
[单项选择]金字塔模型是指______。
A. 阐发主题时,自下向上和逐层细化
B. 阐发主题时,自中间向两边和逐层细化
C. 阐发主题时,自顶向下和逐层细化
D. 阐发主题时,自两端向中间和逐层细化
在线 客服

相关题目