中国第一次派留学生出国深造是从什么时候开始的？

3，6，12，21，33，( )

A．46

B．48

C．44

D．50

在某工地的施工中，工人师傅用如图所示的装置拉起36kg的重物，所用拉力是200N，则该装置的机械效率为         ，若想进一步提高效率，可以对装置采取的措施是（答一项即可）：                        。（g="10N/" kg）

俄罗斯的君王被称为“沙皇”，那么文莱国王称为什么？

Man: I really can’t afford any more interruptions right now. I’ve got to finish the assignment.
Woman: Sorry. Just one more thing, could you give me a ride to school tomorrow
Question: What can be inferred from the conversation().

A. The man will drive the woman to school.

B. The man has finished his assignment.

C. The man is willing to help the woman.

D. The man is losing patience with the woman.