某调查小组要了解某市60岁以上老年人的血压情况，判断此市老年人血压是否比一般老年人血

用我喜欢的方法计算：

13-4.85-3.15

70.9-1.25-1.75．

与普通自行车相比，电动自行车骑行更省力．下表为某一品牌电动自行车的部分技术参数．在额定输出功率不变的情况下，质量为60 kg的人骑着此电动自行车沿平直公路行驶，所受阻力恒为车和人总重的0．04倍．当此电动车达到最大速度时，牵引力为________N，当车速为2 m/s时，其加速度为________  m/s²．（g＝10  m/s²）

下列物质中，既有离子键，又有共价键的是[ ]

A．MgCl₂

B．KOH

C．NH₃

D．H₂O₂

政府定价是指

A．由经营者自主制定，通过市场竞争形成的价格
B．由政府价格主管部门或者其他有关部门按照定价权限和范围规定基准价及其浮动幅度，指导经营者制定的价格
C．山政府价格主管部门按照定价权限和范围规定基准价及其浮动幅度，指导经营者制定的价格
D．由政府价格主管部门或者其他有关部门按照定价权限和范围制定的价格
E．由政府价格主管部门按照定价权限和范围制定的价格

In June 1985, two British mountaineers Joe Simpson and Simon Yates made the first-ever climb of the 21,000-foot snow-covered Siula Grande mountain in Peru. It was an exceptionally (26) job, but nothing compared to what was to (27) . Early in the process, Simpson (28) and broke his right knee. Yates could have (29) him but managed to find a way of (30) him down the mountains on a rope in a series of difficult drops. Then Simpson fell into a crevasse and Yates eventually had no (31) but to cut the (32) , completely convinced that his friend was now (33)

In his book on the (34) , Joe Simpson wrote:

(35) I looked at the distant moraines, I know that I must at least try I would probably (36) there among those rocks. If I died, well, that wasn’t so (37) , but I wouldn’t have (38) waited for it to happen. The (39) of dying no longer affected me as it had in the crevasse at first. I now had a chance to (40) it and struggle against it.

The survival of Yates himself was (41) . That Simpson somehow found a way of (42) out of the crevasse after 12 hours and then crawled and (43) himself six miles back to camp, (44) three days and might without food or drink, would be considered as a heroic fiction. But in fact it was so (45) .

36().

A. stick out

B. hold out

C. hang out

D. die out