According to Paragraph 7, one danger of using natural gas is that
A. there is no way to monitor its transfer across oceans.
B. its accidental release is hard to notice.
C. it is hazardous when mixed with coal or oil.
D. large amounts of it must be stored in a single container.
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The passage states that information can be lost from short-term memory when a person
A. does not know how to read
B. repeats the information over and over
C. processes the information further
D. is distracted for 20 seconds
From colonial times, United States property owners agreed to tax themselves on the theory
A. property owners benefited so that
B. why property owners benefited
C. that if property owners benefited
D. that property owners benefited
如题图所示的简支梁，其截面为不对称工字形，材料为Q235一A．F，钢梁的中点和两端均有侧向支承，上面承受有集中荷载(未包括梁自重)F=160kN(设计值)的作用，中和轴位置如图。
假设房屋类别为弹性方案，柱高H=4．8m，柱间无支撑。试计算独立柱在垂直排架方向的高厚比β，并指出应为()项数值。
A. 8
B. 8．8
C. 10
D. 11
Which sentence below best expresses the essential information in the highlighted sentence
A. Usually information is rehearsed so it can be used later, but sometimes it is rehearsed so it can be used right away.
B. There are several reasons for memorizing information; the most common reason is to improve short-term memory.
C. The belief that "practice makes perfect" causes people to repeat certain behavior. even when the behavior. is very complex.
D. It is fairly simple to keep information in short-term memory, but it is difficult to send it to long-term memory.
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