答：是，理由如下：

∵AD⊥BC，EG⊥BC（已知）

∴∠4=∠5=90°（____）

∴AD∥EG（____）

∴∠1=∠E（____）

∠2=∠3（____）

∵∠E=∠3（已知）

∴（∠1）=（∠2）（等量代换）

∴AD是∠BAC的平分线（____）

①PbO+C  $\frac{\underset{\_}{△}}{}$ Pb+CO （主要）

②PbO+CO    $\frac{\underset{\_}{△}}{}$ Pb+CO₂

③〔Cu （NH₃）₂〕Ac+CO+NH₃ $\frac{\underset{\_}{△}}{}$ 〔Cu （NH₃）₃〕Ac•CO；△H＜0（Ac^﹣代表醋酸根离子此反应无明显现象）

试根据图回答问题：

①Is the picture on the table? ____           A. Nice to meet you, too!

②Thank you! ____                   B. It's a watch.

③Where are the computers? ____         C. You're welcome.

④Is Sally your sister? ____                 D. It's Smith

⑤What's this in English? ____             E. No, it isn't.

⑥Can you spell it, please? ____           F. Yes, A-N-N, Ann.

⑦Is his pen brown? ____                G. No, it's on the wall.

⑧Nice to meet you! ____              H. They're on the desk.

⑨What's his last name? ____             I. Thank you!

⑩Your jacket is very nice. ____              J. Yes, she is.