Genes hang out all lined up on thread-like things called chromosomes(染色体). Chromosomes come in pairs, and there are hundreds, sometimes thousands of genes in one chromosome. The chromosomes and genes are made of DNA, which is short for deoxyribo nucleic acid.

　　Chromosomes are found inside cells, the very small units that make up all living things. A cell is so tiny that you can only see it through the lens of a strong microscope, and there are billions of cells in your body. Most cells have one nucleus. The nucleus, which is sort of egg-shaped, is like the brain of the cell. It tells every part of the cell what to do. How does the nucleus know so much?

　　It contains our chromosomes and genes. Tiny as it is, the nucleus has more information in it than the biggest dictionary you’ve ever seen.

　　1. What does the underlined word “inherit” probably mean in the first paragraph?

　　A. carry

　　B. send

　　C. obtain

　　D. pass

　　2. Which of the following is NOT true according to the passage?

　　A. The parents pass some characteristics on to their children.

　　B. All living things receive traits from the old generations.

　　C. One’s green eyes might be passed on from the parents.

　　D. A mother’s freckled face might affect her young’s face.

　　3. From the passage we can know that________.

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