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  3. If you see a fish tail splash in a shallow stream, you’ll know that a trout is feeding on underwater insects that cling to the r

If you see a fish tail splash in a shallow stream, you’ll know that a trout is feeding on underwater insects that cling to the r

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问题     If you see a fish tail splash in a shallow stream, you’ll know that a trout is feeding on underwater insects that cling to the rocky bottom. A V-shaped wave through the water could be a large fish chasing a smaller one. And a loud jump in a splashy circle may be a big hungry fish gobbling up a frog or a swimming mouse.
    It’s always a good idea to watch the water for a while before you begin fishing. If you can figure out what the fish are feeding on, offer it to them on your hook, and you’ll catch more fish.
    All you need for bait fishing is a line on a pole, a couple of hooks, and some split-shot sinkers. Most of you who fish use earthworms as bait, but in their natural diet, fish eat very few worms.
    The next time you are fishing in a clear stream, turn over some rocks and you will find insects clinging to the undersides. These insects, called nymphs, are good fish bait. Put a nymph on a very small hook and squeeze a split-shot sinker on your line a foot above it. The weight will drift the bait along the bottom of the stream, where the fish normally look for nymphs.
    While you are collecting nymphs, you might also find some caddis cases. These rectangular cases made of tiny pebbles or sticks, are constructed by caddis larvae. Safe in their cases, the larvae cling to the stream’s rocky bottom but sometimes they lose their hold and are carded downstream by the current, and hungry trout gobble them up -- case and all. You can use a caddis case as bait, drifting it along the bottom as you would a nymph.
    Fish also eat caterpillars, grasshoppers, and beetles that fall into or swim on the water. And some fish will eat anything they can fit into their mouths.
    Whatever bait you choose, remember to make it appear natural to the fish. If your sandwich leaped off the plate and danced across the table, you would hesitate to eat it. The same is true of fish. They are very cautious of any food that doesn’t look and act natural.
    Always use a hook smaller than your bait, so the fish won’t see it. If you want the bait to sink, squeeze a split-shot onto the line. If you want it to float, take off the sinker. Watch the water and see how different insects behave; they imitate them with your bait.
The passage is mainly about ______.
选项 A、how to eat fish
B、how to catch insects
C、how to fish
D、fish in the stream
答案C
解析 主旨题。只要浏览每段第一句，了解每段的大意，就可以知道全文的主题。
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