[填空题]My parents always educated me to ______(预留一钱以备急用).

Research on animal intelligence always makes me wonder just how smart humans are. (21) 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-flies (22) to live shorter lives. This suggests that (23) bulbs burn longer, that there is a(n) (24) in not being too terrifically bright. Intelligence, it (25) , is a high-priced option. It takes more upkeep, burns more fuel and is slow (26) the starting line because it depends on learning process—a (27) learning—instead of instinct. Plenty of other species are able to learn, and one of the things they’ve apparently learned is when to (28) Is there an adaptive value to (29) intelligence That’s the question behind this new research. I like it. Instead of casting a wistful glance (30) at all the species we’ve left in t
A. Above all
B. After all
C. However
D. Otherwise