问题补充：
Astronauts in a spaceship have to weightless conditions are quite different from are on the earth.
A. do with; which; those
B. deal with; that; that
C. solve; that; what
D. face; which; these
答案：
A. do with; which; those
B. deal with; that; that
(答案→)C. solve; that; what
D. face; which; these
解析：考查定语从句与宾语从句。句意“宇航员在太空船上需要解决和地球上很不一样的失重情况。”weightless conditions是先行词，后跟的定语从句缺少主语，用which或that；from后跟的是宾语从句，从句缺少主语，指在地球上的重力，用what代替。故选C。
