题目

已知向量。 （Ⅰ）若，分别求和的值； （7分） （Ⅱ）若，求的值。（7分） 答案：（Ⅰ）                            4分                                  7分 （Ⅱ）                                                     又                                                  选出合适的介词，补全句子。（6分）（1）Yesterday I went to the supermarket __________ my mother.（2）We need food ____________ our picnic.（3）Please put your books _____________ your bag.（4）There are lots ____________ people in the park.（5）We went to the Water Park __________ nine o’clock.（6）Please give one apple __________ every child.