题目内容
（请给出正确答案）
The explorers ______ into the unknown regions of the Amazon River.
A．penetrated
B．injected
C．reached
D．stretched
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A.covered
B.invented
C.discovered
D.founded
It can be inferred from the passage that ______.
A．the Apollo mission was very successful
B．protection from space radiation is not an easy job
C．astronauts will have deformed children or grandchildren
D．radiation is not a threat to well-protected space explorers
It can be inferred that Saunders' journey to the North Pole ______.
A．was accompanied by his old playmates
B．set a record in the North Pole expedition
C．was supported by other Arctic explorers
D．made him well-known in the 1960s
