[不定项选择题]男性，51岁。因患胃癌行胃大部切除，手术后2d起咳嗽，痰呈黄脓性，体温39℃，稽留热型。X线胸部摄片示右中肺野大片浸润阴影，并见空洞和液平。痰培养多次为金黄色葡萄球菌。曾应用青霉素、苯唑西林、头孢呋辛、头孢噻肟、头孢他啶、阿米卡星等，病情不见改善。 为确定耐药类型，本例菌株药物敏感试验必须包括
A.头孢唑啉
B.苯唑西林
C.红霉素
D.青霉素
E.妥布霉素

{{B}}North Pole Explorations{{/B}}
If Santa Claus really does reside at the North Pole, he must live a lonely life. The North Pole isn’t what most of us would consider a hospitable place as the average winter temperature there is 40 degrees below zero Fahrenheit (华氏温度) (-40 Celsius). And while Santa’s reindeer are considered Arctic animals, not much life actually calls the North Pole its permanent home.
For adventurers, the North Pole is comparable to outer space: an unknown frontier that’s ripe for exploration--and exploitation. The region doesn’t belong to any one country, so there are always disputes about who can lay claim to the untapped natural resources there. And although the prospect of melting ice around the North Pole isn’t pleasant from a global warming standpoint, it could make those resources easier to reach.
{{B}}North pole location{{/B}}
There are two North Poles. The on
A. overlaps exactly on the geographic North Pole
B. is set according to the Earth’s magnetic field
C. moves along the Canadian Arctic
D. locates 90 degrees north latitude