题干
— How can I get information ________ space travel?
— You can go online to search ________ information.
A：in; for
B：in; /
C：on; for
D：on; /
答案(点此获取答案解析）
C
— How can I get information ________ space travel?
— You can go online to search ________ information.
A：in; for
B：in; /
C：on; for
D：on; /
，
，若
，则实数
的值等于（ ）．
