题干

根据生物进化理论,下列观点中正确的是(  )

A:人工培育的新物种只能生活在人工的环境中

B:生物进化的方向与基因突变的方向一致

C:冬季来临时,植物叶中可溶性糖含量增加是为了更好防止冻伤

D:受农药处理后,种群中抗药性强的个体有更多机会将基因传递给后代

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答案(点此获取答案解析)

D

同类题5

阅读下面短文,从短文后各题所给四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。

    I went to a dinner party at a friend's home last weekend and met her five-year-old daughter for the first time. Little Maya was all curly brown hair, dark eyes, and lovely 1 her shiny pink nightgown ( 睡裙) .I wanted to say, “Maya, you're so2!

    Turn around and model that pretty gown for me. You're beautiful!” But I didn't.

    “Maya,” I said,3into her eyes, “it's very nice to meet you.”

    “ Nice to meet you, too.” She said, in that4, talking-to-adults, good girl voice.

    “Hey, what are you reading?” I asked. Her eyes got bigger, and the practiced, polite facial 5gave way to real excitement over this6. But she seemed too7 to answer me.

    “I love books,” I said. “Do you?”

    Most8do.

    “Yes,” she said. “And I can9them all by myself now!”

    “Wow,10!” I said. And it is, for a five-year-old.

    “What's your favourite book?” I asked.

    “I'll go and get it! Can I read it to you?”

    Purplicious was Maya's11, and a new one to me, as she sat next to me and12read aloud every word. Then I told her that I'd just13a book, and that I hoped she'd write one, too, one day. She was crazy14 that idea. We were both sad when Maya had to go to bed,15I told her next time to choose another book and we'd read it.

    Try this the next time you meet a little girl. She may be16and unsure at first, because few people ask her about her17, but be patient and stick with it. Ask her what she's reading. What does she like and dislike, and why? You're just18 an intelligent (明智的) conversation that respects her brain. Tell her about your19 and accomplishments, and your favourite books. Set a good example for her of what a 20woman says and does.