Answer: B [Analysis] Dragonflies point to water in order to lay eggs. Dragonflies are different from many other insects in that their eggs hatch in the water, and the larvae also live in the water, so the water lays eggs.
Answer: B [Analysis] Reading glasses, also known as reading glasses, are a kind of optical products, which are used by people with presbyopia, which belong to a convex lens.
Answer: C [Analysis] When the general sound is about 30 decibels (dB), it will not affect normal life and rest. And when it reaches more than 50 decibels (dB), people have a greater feeling and it is difficult to fall asleep. Generally, a sound of 80 decibels (dB) or more is considered noise.
Answer: A analysis] Peanut is one of the crops most susceptible to Aspergillus flavus, aflatoxin has a very high affinity for peanuts, and the infection of Aspergillus flavus and the production of aflatoxin not only occur in the planting process of peanuts, but also occur in the processing process.
Answer: D Analysis] Cigarette butts are made of polypropylene wire.
The bundle is not toxic in itself, but in the process of smoking, nicotine and other substances are filtered and contaminated with saliva, so it can no longer be used. Today's disposable tableware is biodegradable and is generally allowed to degrade after use. However, it cannot be reused. Both belong to other garbage.