[单选题]男，68岁，高热，畏寒，剧烈头痛入院，用青霉素治疗无效，发病第5天，除面部外，于胸、肩等处出现鲜红色斑丘疹，于内衣见有跳蚤。经化验室检查，诊断为斑疹伤寒。宜选用下列药物治疗
A.头孢他啶
B.链霉素
C.磺胺嘧啶
D.多西环素
E.庆大霉素

The European Union had approved a number of
genetically modified crops until late 1998. But growing
public concern over its supposed environmental and health 62. ______
risks led several EU countries to demand a moratorium (暂时
禁止) on, imports of any new GM produce. By late 1999
there were enough such country to block any new approvals 63. ______
of GM produce. Last year, America filed a complaint at the
WTO about the moratorium, arguing that it was an illegal
trade barrier because there is no scientific base for it. 64. ______
As more studies have been completed on the effects of
GM crops, the greens’ case for them has weakened. 65. ______
Much evidence has emerged of health risks from eating them. 66. ______
And, overall, the studies have shown that the environmental
effects on modified crops are not always as serious as the 67. ______
greens clai