多选题 Recent advances indicate that cures for some seemingly intractable diseases are now within reach, but scientists are being ______ in their public statements, mindful of past claims that proved ______.

A、 nonchalant
B、 circumspect
C、 adamant
D、 unambiguous
E、 unimpeachable
F、 apocalyptic

【正确答案】 B、F

【答案解析】[解析] ● 逗亏说明前后同义重复。
● 第一空与mindful(小心的)同义重复。nonchalant冷漠的，circumspect小心的，adamant固执的。答案选B。
● 第二空与cures for some seemingly intractable diseases are now within reach(一些看似难以治疗的疾病现在有了治疗方法)同义重复。unambiguous明确的，unimpeachable无可置疑的，apocalyptic夸大的。答案选F。