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举一反三
【单选题】In the background was that eternal hum.（ ）
A.
long
B.
never-ending
C.
boring
D.
extensive
【单选题】The boys________the newspaper on the ground and began to read the news and articles in it. [ ]
A.
extended
B.
expanded
C.
stretched
D.
spread
【单选题】The word 'monopolize' in the last paragraph means ______.
A.
confine
B.
migrate
C.
control
D.
extend
【单选题】What does the comment 'This is logical' mean?
A.
There is no clear way to determine the extent of our ancestor' s knowledge of plants.
B.
It is not surprising that early humans had a detailed knowledge of plants.
C.
It is reasonable to assume that our ancestors behaved very much like people in preindustrial societies.
D.
Human knowledge of plants is well organized and very detailed.
【单选题】The internal force of a material, which tends to resist deformation when subjected to external forces, is known as _____.
A.
stress
B.
strain
C.
shear strength
D.
ultimate tensile strength
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