[单项选择]以一种检验方法诊断癌症，真患癌症和未患癌症被诊断正确的概率分别为0.95和0.90．今对一批患癌症比率为2%的人用此方法进行检验，则其中某人被诊断为患有癌症时，他真的患有癌症的概率为
A. 0.462
B. 0.362
C. 0.262
D. 0.162

With the world’s population estimated to grow from six to nine billion by 2050, researchers, businesses and governments are already dealing with the impact this increase will have on everything from food and water to infrastructure (基础设施) and jobs. Underlying all this (1) will be the demand for energy, which is expected to double over the next 40 years. Finding the resources to meet this demand in a (2) , sustainable way is the cornerstone (基石) of our nation’s energy security, and will be one of the major (3) of the 21st century. Alternative forms of energy—bio-fuels, wind and solar, to name a few—are (4) being funded and developed, and will play a growing (5) in the world’s energy supply. But experts say that even when (6) , alternative energy sources will likely meet only about 30% of the world’s energy needs by 2050. For example, even with (7) investments, such as the $93 million for wind energy. development (8) in the American Recovery and

某海港拟建3个2.5万t级泊位码头，业主通过招标选择施工单位，某一级港口与航道专业资质的施工单位与具有二级港口与航道专业资质的施工单位组成联合体参加投标。
问题：
(1)何谓联合体投标?
(2)对组成的联合体资质有什么规定?
(3)根据其资质，业主能否接受该联合体承接拟建码头吨级的投标?