为你解答.
1、Lijiang is (A.popular ) with tourists for its beautiful old buildings.
丽江因为它漂亮的古老建筑,受到游客们的欢迎.
be popular with sb,受某人欢迎.
2、--There used to be lots of fish in the lake.
--Yes, but there are very (B.few ) now.
这个湖过去有很多鱼. 对,但是现在非常少了.
解释：very 不能用于比较级之前.为什么不用famous，be famous forbe famous for在这一句中不合适。宾语是游客tourist，你不能说因为游客出名吧，而且介词也不是for,而是with。