One major ______ of space travel is the radiation that exists beyond Earths atmosphere.A．m

The article opens and closes with descriptions of two news reports, each ______ one major

The process of urbanization has caused many problems, the major one is ______.A．economyB．t

To become a member of the two major parties in America, one needs to ______________.A.

When a spacecraft travels, one of the major problems is reentry into the Earth’s _______.A

She is going to France on a special ______ for one of the major daily newspapers.A．assignm

This book discusses the most recent events of space travel, it certainly is ____. A：up t