Not only should you get used to _____ under difficult conditions but also you should pay more attention to _____ your work well。

在香港回归祖国10周年的日子里，《香港商报》发表了题为《十载不凡路，香江书华章》的社评。其中有这样的评论：“如果说十年前无论是国际社会，还是香港 本地，都有不少人对‘一国两制’‘港人治港’心存怀疑，今天，所有的疑虑都已经烟消云散了……”请你给该评论加一个合适的标题(　　)

选择适当的选项补全对话。

A. Is he friendly? B. Yes, you're right. C. A boy or a girl? D. Who's he? E. No. He has glasses and his shoes are blue.

John: Hello, Sarah! I have a new friend.
Sarah: ____
John: A boy.
Sarah: ____
John: He is tall and thin. He has short hair.
Sarah: ____
John: Yes, and he is nice, too.
Sarah: Is he Mike?
John: ____
Sarah: I know. He is Peter. He is near the door.
John: ____

以下是对甲、乙、丙三人血清中的氨与尿素，尿液中的尿素的检测结果，三人的健康状况最可能是 

如图所示，半径为R的 $\frac{1}{4}$ 光滑圆弧槽固定在小车上，有一小球静止在圆弧槽的最低点．小车和小球一起以速度v向右匀速运动．当小车遇到障碍物突然停止后，小球上升的高度可能是（   ）