题目

已知正三棱柱的棱长相等，是的中点，是的中点，则异面直线和所成角的余弦值是（   ）         A.          B.       C.         D. 答案：.A句型转换。1. We call it a kid. (画线提问)                        ______________________________________ 2. Those are shops. (画线提问)                        ______________________________________ 3. I have one maths lesson on Monday. (画线提问)                               ___________________________________4. They are elephants. (单数)                                  _________________________________ 5. Is that little bird nice? (肯定句)                              ___________________________________ 6. There are some balloons in the classroom. (一般疑问句)                          _____________________________________7. There is some water in the bottle. (否定句)                           _____________________________________8. Please read English now. (否定句)                                    ________________________________9. I am ill today. (一般疑问句)                                __________________________________10. We often go to the park on Monday. (一般疑问句)                              ___________________________________