单项选择题

Hydrogen ______.

A．is a widely-used fuel
B．is not yet in general use as a fuel
C．is not a particularly easy fuel to store
D．is a more economical fuel than wind energy
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单项选择题
What do I' mean as high praise (Line 8, Para. 2)
A．Lincoln was a decent man, a good politician, and a great President.
B．Lincoln belonged in the pantheon of the gods.
C．Lincoln was the best kind of ordinary man.
D．Lincoln was a good man.
单项选择题
What does the word assassinate in the last sentence mean
A．Attack.
B．Murder.
C．Kidnap.
D．Abuse.
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