器官移植手术对医院等级的规定是（）。 A.没有要求 B.二级甲等 C.三级甲等 D.

我国职业病名单中，列入职业肿瘤。可引起皮肤癌的毒物是

A．联苯胺
B．氯甲醚
C．石棉
D．砷
E．焦炉逸散物

依据我国《物权法》，下列关于土地承包经营权的说法错误的是：( )。

A．甲为土地承包经营权人，其承包期还有20年届满。甲将其土地转让给乙，期限为19年
B．甲通过拍卖取得了一块荒地的承包经营权，后将该土地承包经营权抵押给其债权人乙
C．土地承包经营权人甲将其承包经营权转让给好友乙，但是未经登记，故该转让不生效
D．甲通过投标取得一块荒地的经营承包权，但是未经依法批准，不得将其转让给房地产商开发商品房

A

Once there was a piano player in a bar (酒吧). People came just to hear him play. But one night, a lady asked him to sing a song.
"I don’t sing, "said the man.
But the lady told the waiter, "I’m tired of listening to the piano. I want the player to sing!"
The waiter shouted across the room, "Hey, friend! If you want to get paid, sing a song!"
So he did. He had never sung in public before. Now he was singing for the very first time! Nobody had ever heard the song Mona losa sung so beautifully!
He had talent(天赋) he was sitting on! He may have lived the rest of his life as a no-name piano player in a no-name bar. But once he found, by accident, that he could sing well, he went on working hard and became one of the best-known singers in the US. His name was Nat King Cole.
You, too, have skills and abilities. You may not fell that your talent is great, but it may be better than you think. With hard work, most skills can be improved. Besides, you may have no success at all if you just sit on your talent.

Which could be the best title(标题)for the passage ( )

A．Sing in the Bar

B．Achieve Success in Life

C．Never Lose Heart

D．Find Your Hidden Talent

世事的变化如______，社会的发展越来越快，故乡的面貌______，但更新中也有无法弥补的遗憾。
依次填入画横线部分最恰当的一项是( )。

A．沧海桑田 变化多端
B．白云苍狗 日新月异
C．日出日落 如隔三秋
D．云谲波诡 天翻地覆

用标准HCL溶液不能直接滴定CaCO₃，因在接近化学计量点时，CaCO₃溶解很慢，甚至不能完全溶解，若加入过量的标准HCL溶液并温热使其溶解，然后用标准碱液滴定剩余的HCL就可以算出CaCO₃的含量，这种滴定方式属于（）。

A.直接滴定法

B.返滴定法

C.置换滴定法

D.间接滴定法