[单项选择]______evidence that language-acquiring ability must be stimulated.
A. It being
B. It is
C. There is
D. There being

[单项选择]（　） evidence that language-acquiring ability must be stimulated.
A. It being
B. It is
C. There is
D. There being

[单项选择]（） evidence that language-acquiring ability must be stimulated.
A. It being
B. It is
C. There is
D. There being

[单项选择]______ evidence that language-acquiring ability must be stimulated.
A. If being
B. It is
C. There is
D. There being

[填空题]If the management provides pleasant background music and beautifies the dull setting,_________________ (工厂的生产效率就可以大大提高).

[单项选择] Mathematical ability and musical ability may not seem on the surface to be connected, but people who have researched the subject—and studied the brain—say that they are. Three quarters of the bright but speech-delayed children in the group I studied had a close relative who played a musical instrument. The children themselves usually took readily to math and other analytical subject and to music. Black, white and Asian children in this group show the same patterns. However, it is clear that blacks have been greatly overrepresented in the development of American popular music and greatly underrepresented in such fields as mathematics, science and engineering. If the abilities required in analytical fields and in music are so closely related, how can there be this great discrepancy One reason is that the development of mathematical and other such abilities requires years of formal training, as has happened with a number of well-known black musicians. It is precisely i
A. Mathematical ability and musical ability are connected.
B. Mathematical ability has more to do with the brain than musical ability.
C. More people are good at music than math.
D. More research should be done into the relationship between mathematical ability and musical ability.

[填空题]
If music makes you smarter, and exercise helps brain function, can exercising to music really boost brainpower Some researchers said it can. Volunteers who listened to Vivaldi’s "Four Seasons" while working out on a treadmill did much better on a test of (1) ability than when they exercised without music, a team (2) Ohio State University found.
"Evidence suggests that exercise improves the (3) performance of people with coronary artery (4) ," said psychologist Charles Emery, who led the study.
"And listening to music is (5) to enhance brainpower. We wanted to put the two results together," Emery (6) in a statement.
Writing in the latest issue of the journal Heart & Lung, Emery and (7) said they studied 33 men and women taking (8) in a cardiac rehabilitation program after having bypass