商业信用的最高界限是企业（）。 A.自有资本 B.可变资本 C.企业可贷出的商品资本

（）奠定了“作者论”的基础。

用恰当的词语填空，完成对话。每空一词。

A: Good morning, sir! Can I 1______ you?

B: I would like to buy an MP4.

A: Here is a new kind. Please have a 2______

B: OK. Let me try to listen to it.

A: Is it loud and clear enough?

B: Yes, it is. But I don't like black. Have you got a red one or a white one?

A: Yes. How about this red one?

B: It's nice. How 3______ is it?

A: 300 yuan. Is it OK?

B: Oh, dear! That's too expensive. Can it be 4______?

A: You can pay 50 yuan less. That's the last price.

B: OK. I'll 5________ it. Here's the money.

大兴安岭东西两侧的地形是[ ]

A．黄土高原、华北平原

B．云贵高原、青藏高原

C．东北平原、内蒙古高原

D．长江中下游平原、四川盆地

能升高眼内压的抗心律失常药为

A．普鲁卡因胺
B．丙吡胺
C．维拉帕米
D．胺碘酮
E．奎尼丁

机动车仪表板上（如图所示）亮时，提醒发动机冷却液可能不足。