单项选择题

According to the passage, black holes ______.

A．include protons
B．oppose the quantum theory
C．stop anything from escaping
D．give off radiation
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单项选择题
According to paragraph 4, nearly 50 percent of children suffer malnutrition in ______.
A．Uzbekistan
B．South Asia
C．South Africa
D．India
单项选择题
What is Hawking's chief contribution to science according to this passage
A．His quantum theory.
B．His blackhole theory.
C．His application of thermodynamics to blackholes.
D．His prediction that the universe would contract and time would reverse.
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