High school mathematics multiple choice questions

Of the four propositions given, 1 and 3 are all wrong, so choose D.

There are three straight lines passing through point A and three straight lines passing through point C 1, so six straight lines intersect with AC 1, 12, and the remaining six straight lines are all in the same plane with AC 1? , choose C.

The straight line CE and A 1C 1 define a plane. Of the four given straight lines, only BD is perpendicular to this plane. Choose B.

1998 college entrance examination time and subjects in Shanxi

Mathematics for the senior high school entrance examination in Shanghai in 2009

What is the history of BBK's new college entrance examination?

Are there any oral arithmetic exercises with numbers less than 10 thousand in the second volume of grade two in primary school? (PEP) Please send one, thank you!

Mathematical simulation problems in the first volume of the eighth grade

When is the National Mathematical Modeling Competition for College Students?

Problems that mathematics can't solve

Junior one Chinese composition

Guess the numbers in other people's minds (teach you magic-what's on your mind)

Excuse me, how to do "dislocation subtraction" in high school mathematics series? I forgot, please give an example, thank you!