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问题 选择题
若
a
=（-2，1），
b
=（x，-3），
a
∥
b
，则x=（　　）
A．
3
2
B．
2
3
C．6D．
1
6
答案

∵

a
∥
b
，∴1×（-3）-（-2）x=0，解得x=
3
2
．

故选A．

问答题

       据《史记》记载秦孝公死后，旧贵族诬告商鞅谋反结果商鞅被处死。你认为商鞅变法是成功了，还是失败了？为什么？

                                                                                                                                                            

                                                                                                                                                            

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                            

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单项选择题

异位妊娠时，受精卵最易着床的部位是（）

A.宫颈

B.卵巢

C.输卵管

D.腹腔

E.阔韧带
查看答案