单项选择题

The United States is ______ country in the world.

A．the most populous
B．the second most populous
C．the third most populous
D．the fourth most populous
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单项选择题
The two newest states which joined the United States are ______.
A．Alaska and Kentucky.
B．Hawaii and Arizona.
C．Alaska and Hawaii.
D．Vermont and New Mexico.
单项选择题
Which of the following statements is NOT true of the cosmos
A．Microwaves are the medium WMAP used to make measurements.
B．Warmer spots would finally develop into the clusters of galaxies.
C．Dark energy is a decisive factor in the cosmic expansion.
D．The nature of dark matter in space is unknown to scientists.
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