Research on animal intelligence always makes me wonder just how smart humans are. (51) the fruit-fly experiments described in Carl Zimmer’s piece in the Science Times on Tuesday. Fruit flies who were taught to be smarter than the average fruit fly (52) to live shorter lives. This suggests that (53) bulbs burn longer, that there is an advantage in not being too terrifically bright.

Intelligence, it (54) , is a high-priced option. It takes more upkeep, burns more fuel and is slow off the starting line because it depends on learning—a (55) process—instead of instinct. Plenty of other species are able to learn, and one of the things they’ve apparently learned is when to (56) .

Is there an adaptive value to (57) intelligence That’s the question behind this new research. I like it. Instead of casting a wistful glance (58) at all the species we’ve left in the dust I.Q.-wise, it implicitly asks what the real (59) of our own intelligence might be. This is on the mind of every animal I’ve ever met.

Research on animal intelligence also makes me wonder what experiments animals would (60) on humans if they had the chance.

57().

A.invisible 

B.limited 

C.indefinite 

D.different

尾箱监管人的职责包括（）

A.监督尾箱的日常管理，纠正尾箱经管人违章操作行为

B.营业终了，对尾箱的现金核查大数

C.对尾箱现金和凭证交接予以监交及授权

D.营业终了尾箱交收前，检查柜员办公场地，防止尾箱、现金或重要空白凭证遗漏