question_answer

Directions: in the following questions, you have passages where some of the words have been left out. First read the passage over and try to understand what it is about. Then, fill in the blanks with the help of the alternatives given. Something has happened in the last twenty years that surely must 311 anything that has happened before. Some historians are already saying that thrust 312 space represents avital turning point in history. Moon flights are considered 313 less than steps in human evolution 314 to the time when life on Earth emerged from the sea and established itself on land. Of course, not everyone 315 enraptured by space. Critics have often said that space flight has been an 316 use of resources that should have 317 to feeding, clothing and housing people. There is, however, no proof that if we had 318 been working on space, we would have done anything of great human value. In fact, research and exploration have a 319 spin-offs, quite apart from the fact that they demonstrate that 320 is alive and insatiably curious.

A) not

B) occasionally

C) seldom

D) possibly