What is the one reason astronomers make long time exposures
A. To spend less time at their telescopes.
B. To overcome the problem of weak light.
C. To take more photographs.
D. To photograph astronomical objects without using a telescope.
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说话人在口语实践中，在音量，声调、节奏、语气、用词、造句、修辞以及神情、姿态、动作等多方面表现来的整体性特征，是指口语风格的______
A. 独特性
B. 稳定性
C. 综合性
D. 重复性
The Soviet Union was not listed as a third-world nation just because of ______.
A. its powerful military forces
B. its vast land
C. its industrial competitiveness
D. its contributions to world peace
What characteristic do Americans like about the Shaker furniture
A. Its ornaments.
B. Its lightness.
C. Its simple designs.
D. Its value.
Why are the archaeologists interested in dendrochronology
A. They can measure constructions.
B. It helps them study past society.
C. It provides a time tracing procedure.
D. They can build more buildings.
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