According to the passage, when gathering materials to build their nests, sparrowhawks do which of the following()
A. Hang upside down
B. Select only green twigs
C. Use objects blowing in the wind
D. Collect more branches than necessary
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All of the following are mentioned in the passage as contributing to the ability to play modem violin music EXCEPT()
A. more complicated techniques for the left hand
B. different ways to use the fingers to play very high notes
C. use of rare wood for the fingerboard and neck
D. minor alterations to the structure of the instrument
与红细胞成熟有关的维生素是
A. 维生素B1和遍多酸
B. 维生素B12和叶酸
C. 维生素B6和叶酸
D. 遍多酸和叶酸
The word "display" in line 17 is closest in meaning to()
A. communicate
B. imitate
C. initiate
D. exhibit
In western North America () form the Great Divide, which separates the areas from which waters flow either eastward to the Atlantic or westward to the Pacific.
A. the Rocky Mountains
B. where the Rocky Mountains
C. the Rocky Mountains in which
D. there are the Rocky Mountains