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【多选题】
An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. Originally, natural gas was not considered a useful commodity and it has only become a major source of energy in the last century. ______ ______ ______ Answer ChoicesA.
Natural gas differs from other fossil fuels in that it is not found in underground deposits.
B.
Natural gas is extracted from both associated and non-associated sources, and there are many different varieties.
C.
Some deposits of natural gas contain high concentrations of impurities such as sulfur and cannot be used commercially.
D.
Because it burns cleaner than coal and oil, natural gas is much less damaging for the environment.
E.
One of the main drawbacks in the use of natural gas is that it cannot be piped across oceans.
F.
Natural gas is an appealing alternative to other fossil fuels because it is cheaper, more easily transported, and more abundant.
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举一反三
【单选题】平行反应(1)A®B (2)A®C, 已知活化能E1>E2,指前因子A1>A2。那么(1)降低反应温度;(2)提高反应温度;(3)加入适当催化剂;(4)延长反应时间;其中能增加产物B的方法有( )
A.
(1)(3)
B.
(2)(4)
C.
(3）（4）
D.
(2)(3)
【单选题】以下介入游戏的时机不恰当的是( )
A.
当幼儿游戏出现困难时
B.
当儿童对游戏失去兴趣或准备放弃时
C.
在游戏内容发展或技巧方面发生困难时
D.
当儿童就游戏内容展开讨论时
【简答题】杆件压缩时的应力状态在偏平面上的位置是()(约定σ1最大......)
【单选题】关于光的色散，下列说法中正确的是（ ）
A.
白光通过棱镜时会发生色散现象
B.
红光通过棱镜时会发生色散现象
C.
绿光通过棱镜时会发生色散现象
D.
蓝光通过棱镜时会发生色散现象
【单选题】白光发生色散时,
A.
从顶到底依次出现红橙黄绿青蓝紫
B.
从底到顶依次出现红橙黄绿青蓝紫
C.
从顶到底随机出现各种颜色
D.
从左到右在水平方向依次出现红橙黄绿青蓝紫
【单选题】已 知 下 列 电 池 反 应 ： (1) A + B2+ ® A2+ + B Eθ> 0 V (2) A + C2+ ® A2+ + C Eθ> 0 V其中 A 、B 和 C为金属单质则标准状态时，B2+和C之间的反应
A.
为 自 发 反 应
B.
处 于 平 衡 状 态
C.
为 非 自 发 反 应
D.
进 行 的 方 向 不 能 判 定
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