When she came several days later, she fo

美国著名的篮球巨星乔丹（如下图），他的祖先在撒哈拉以南的非洲，关于他的祖先去美国的原因叙述，正确的是

A．他的祖先自愿去美国发展

B．他的祖先在美国有亲戚

C．他的祖先是被殖民者以奴隶的形式贩运到美国

D．他的祖先通过移民的方式去了美国

下列现象与太阳辐射有关的是

A．两极地区的极光

B．地球内部温度不断升高

C．地热能发电

D．水能的形成

补全对话。

Peter: Oh, David. Please don't put anything on this desk!

David: 1_____?

Peter: Look! This leg is broken.

David: 2_____. When did you find it?

Peter: I found it just now when I was sweeping the floor.

David: Let's tell our teacher about it at once and then someone will repair it.

Peter: No. 3_____.

David: Yourself? Have you learnt to repair a desk?

Peter: Yes. My father is an expert in repairing things. 4_____.

David: Oh, your father taught you. That's great! Do you think 5_____ ourselves?

Peter: Certainly. Let's begin.

在对企业各项指标的考核中，必须把安全工作放在工要位置，并使其具有（）。

A、优先权

B、否决权

C、主动权

D、评比权

烹饪过程中维生素大致损失顺序为

A． VC＞VB1＞VA＞VE