单项选择题

It can be inferred from the passage that ______.

A．the Apollo mission was very successful
B．protection from space radiation is no easy job
C．astronauts will have deformed children or grandchildren
D．radiation is not a threat to well-protected space explorers

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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

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.