____________ no doubt that 100 years ago animal testing was cruel but today animals in experiments are very well taken care of.
A．It isB．There isC．This isD．That is
B
考查句型：There is no doubt that 毫無(wú)疑問做某事，句意：毫無(wú)疑問一百年前動(dòng)物檢測(cè)很殘忍但是今天在試驗(yàn)中的動(dòng)物們被非常很好的照顧。所以選B。
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