单选题   Dear David,
    I'm glad you would like to share your feelings with me. It's hardly surprising that your feelings of not being 'grown up' have come on strongly at this point in your life, just before you're about to become a father. I think nearly every sensitive about-to-be-parent must have these occasional feelings of self-doubt and inadequacy (不适) before the birth and it would be most unusual if you didn't share them.
    It's difficult, honestly, to feel grown-up unless you have something less grown-up to relate to. The boss with a hen-pecking wife may feel like a seven-year-old when he's at home. But as he walks through the office door, and knows he's going to be surrounded by staff looking to him for advice, he grows into a fully mature (成熟的) man. And I think it's a mistake to imagine that we all feel, as we age, a kind of progression of states, from the baby to the adult. Most people feel, on Tuesday, about three years old, and on Wednesday, around 80.
    There's a common remark that 'all men are little boys', but it's not true. It's more true that men often behave like little boys. But nearly all people, at some moments in their lives, are able to be great mature.
    Once your baby arrives, you'll soon feel less childlike, or rather, less often. When your child tries to put its fingers into the electric plug, the adult in you will rise up to prevent it. You'll see you have very little in common with a needy child, particularly if it's looking to you for comfort and support.
    Comfort yourself, David. Hope my advice will be helpful and good luck to you and your little one.
   

单选题     According to the passage, Miss Advice thinks David's self-doubt ______.

单选题     From Paragraph 2, we can learn that people's sense of maturity ______.

单选题     Miss Advice holds the view that ______.

单选题     What does the underlined sentence means? ______