女，35岁。劳累后心悸、气短10年，近1周间断咯血，无发热。查体：双颊皮肤紫红，口唇

—Why are the two students standing at the gate of the teachers'office?

—They________to each other in class and________.[ ]

A. have whispered; are punishing

B. had whispered; were punished

C. whispered; are being punished

D. are whispering; were being punished

　　　　 so much salt in the Dead Sea that people won’t get sunk.

A．It exists

B．T here has existed

C．There exists

D．It has existed

谢灵运在其《山居赋》中说：“春秋有待，朝夕须资。即耕以饭，亦桑贸衣。艺菜当肴，采药救颓。”这说明了他的山居[ ]

A．从事商品生产

B．田庄里生产分工明确，交换频繁

C．过着自耕农的生活

D．田庄里是自给自足的自然经济

下列关于闭水试验要求说法正确的是( )。

A．闭水试验应在管道灌满水后12h后再进行

B．闭水试验应在管道填土前进行

C．闭水试验的水位，应为试验段上游管道内顶以上1m

D．对渗水量的测定时间不少于14min

在规划中提到的长春是资源优势中湿地资源有哪些？