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68（）

A. learn
B. to learn
C. and learning
D. and to learn

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A. Preparation.
B. Incubation.
C. Illumination.
D. Revision.

A. in appearance, but not in taste
B. neither in appearance nor in taste
C. both in appearance and in taste
D. in taste, but not in appearance

A. blank
B. faint
C. dim
D. vain

A. Professor Warren A．Nord.
B. The astronomer Arthur Eddington.
C. Some ancient saga.
D. The author of this passag