A．To give an example of natural shapes.B．To describe early sculpture.C．To illustrate t
A. To give an example of natural shapes.
B. To describe early sculpture.
C. To illustrate their use as tools.
D. To demonstrate their role as decorative objects.
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A．To show that enzymes are very effective.B．To point out that enzymes can sometimes fa
A. To show that enzymes are very effective.
B. To point out that enzymes can sometimes fail to work.
C. To explain what enzymes are made of.
D. To describe different types of enzymes.
A．It is often displayed outdoors.B．It does not always represent an object.C．It is thre
A. It is often displayed outdoors.
B. It does not always represent an object.
C. It is three-dimensional.
D. It is done by relatively few artists.
A．Provide extra energy to start the reaction.B．Raise the temperature of the chemicals.
A. Provide extra energy to start the reaction.
B. Raise the temperature of the chemicals.
C. Release a chemical needed to start the reaction.
D. Lower the amount of energy needed to start the reaction.
The seat of France's North American holdings in the eighteenth century was Quebec, and the
A. to remain
B. remaining
C. by remaining
D. has remained
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