小明按图所示连接了电路，电压表和灯L₁并联，测得灯L₁两端的电压为U₁．现在他想改测灯L₂的电压U₂，小红告诉他：只须将电压表接A的一头改接C即可．这种说法正确吗？为什么？

种子萌发是指种子从吸胀作用开始的一系列有序的生理过程和形态发生过程．种子在萌发时所具备的内在条件主要是（    ）

①种子本身发育完全

②种子已通过休眠阶段

③在种子的寿限之内

④种子完好无损．

古诗鉴赏，按要求答题。
                                                                                                                              己亥杂诗 龚自珍 清
                                                                                                                  浩荡离愁白日斜，吟鞭东指即天涯。

                                                                                                                  落红不 是无情物，化作春泥更护花。

词语运用

①The old man is d____.He can't hear anything.

②My dog is m____.Can you help me find it?

③All of them are ____(注视) at the computer screen.

④We don't know whether he's ____(活着)or dead.

⑤The road was so narrow(狭窄)that cars were unable to ____(通过).