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

The best title for this passage would be ______.

A．The Atmosphere and Our Environment
B．Research on Radiation
C．Effects of Space Radiation
D．Importance of Protection Against Radiation

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.