题目内容

( Found )in the (shells of) lobsters, shrimp, and crabs, glucosamine (is also)_ present in human cartilage, which (covering )the bones in joints.（）

A. Found
B. shells of
C. is also
D. covering

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Lightning (tends to) strike the nearest (good conductor), and hence often strikes (in same) place more (than once).（）

A. tends to
B. good conductor
C. in same
D. than once

In the nineteenth century, Montreal grew (into) an important (transportation) and industrial center, (aided) by its many natural resources and an (abundant of )hydroelectric power.（）

A. into
B. transportation
C. aided
D. abundant of

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A. conceptual
B. musical
C. generally
D. mentioned

According to the passage, one advantage of sea island cotton was its（）

A. abundance of seeds
B. long fibers
C. long growing season
D. adaptability to different climates