（）跑和（）是提高学生有氧代谢能力的有效手段.

根据对话内容，从对话后的选项中选出能填入空白出的最佳选项。选项中有两项为多余选项

W: Hello, Jack. You're getting ready for tomorrow's lessons, aren't you?

M: Yes, I'm a bit nervous.   1   

W: I understand how you're feeling. You'll make a lot of friends very soon.

M: Thank you. I'll try my best to get used to my new school life as soon as possible.    2   

W: At 8 o'clock.    3   

M: Say it, please.

W: Before class we have 10 minutes to hand in homework and then 20 minutes for morning reading.

M: That's to say, we must get to school at 7:25. Five minutes later we'd hand in homework. Right?

W: Right.   4   

M: Well, I hear that lunch time is nearly 12 o'clock and I'll be starving by then.

W: Don't worry.    5    

M: That's great.

A. So I suggest you get up before 7:00.

B. By the way, what time does the first class begin?

C. How long will it take us to finish our homework?

D. But there is some other suggested time you should remember.

E. During the break after the second class, we can buy something to eat.

F. I have no idea what'll happen in class and how I'll get along with my classmates.

G. I really don't know what to do after class.

中国人民银行授权中国外汇交易中心公布，2009年4月10日，银行间外汇市场人民币汇率中间价为：1美元对人民币6.98元，突破7整数关口，再次创出汇改以来的新高。这说明 [ ]

①外汇汇率升高 ②人民币兑换美元增多 ③外汇兑换的人民币增多 ④外汇汇率跌落

A．①③

B．③④

C．①②

D．②④

决定尿量多少最关键的部位是（）

A.肾小囊

B.近曲小管

C.髓袢升支

D.髓袢降支

E.远曲小管和集合管

某同学用刻度尺测金属丝的长度l，用螺旋测微器测金属丝的直径d，其示数分别如图1和图2所示，则金属丝长度l=________cm，金属丝直径d=        mm。他还用多用电表按正确的操作程序测出了它的阻值，测量时选用“×1”欧姆挡，示数如图3所示，则金属丝的电阻R=_________Ω。

图1

在微机的三种总线中，数据总线用于微处理器、存储器和输入/输出设备之间传送数据。