单项选择题

We know from the passage that ______.

A．exposure to even tiny amounts of radiation is fatal
B．the effect of exposure to radiation is slow in coming
C．radiation is avoidable in space exploration
D．astronauts in spacesuits needn't worry about radiation damage

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单项选择题

What is the main idea of this passage

A．Plugging poor countries into the Internet will help them to become rich rapidly.
B．Poor countries should be given more basic devices other than advanced ones.
C．Rich countries should help poor ones becoming rich.
D．People in poor countries cannot afford devices such as computer.

单项选择题

We can infer from the 2nd paragraph that:

A．people in poor countries cannot use computer because of illiteracy.
B．poor people cannot use computers.
C．there would be no magic to cause a computer to appear in every household on earth.
D．people in poor countries need more basic living conditions than computers.