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【单选题】
下图所示的“碳海绵”是已知最轻的固体材料，它由碳元素组成，具有多孔结构，弹性好，对石油有很强的吸附能力（不吸水），将吸入的石油挤出后仍可恢复原状。下列说法错误的是A.
“碳海绵”具有吸附性，可重复使用
B.
“碳海绵”可处理海上石油泄漏
C.
“碳海绵”在一定条件下可还原氧化铜
D.
“碳海绵”在氧气中完全燃烧的产物是CO 2 和CO
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【单选题】We can infer from the passage that the oldest form. of communication between people is ______.
A.
speech
B.
touch and heating
C.
sounds
D.
body language
【单选题】We can infer from the passage that the oldest form. of communication between people is ______.
A.
speech
B.
touch and hearing
C.
sounds
D.
body language
【简答题】Barter trade is the oldest form of trade, which is a direct exchange of one goods for another deemed to be of approximately equivalent value without any flow of money taking place. It is a primitive w...
【单选题】Water is the oldest form. of transport. The original sailing vessels were replaced by steamboats in the early 1800s and by diesel power in the 1920s. A distinction is generally made between deepwater ...
A.
Steamboats are the original sailing vessels.
B.
Steam power followed diesel power.
C.
Deepwater and navigable inland water transport are equivalents.
D.
There is domestic commerce in the Atlantic Ocean.
【单选题】we can infer from the passage that the oldest form. of communication between people is ______.
A.
speech
B.
touch and hearing
C.
sounds
D.
body language
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