问题
选择题
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
答案：C
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。