题干

转基因植物可能引起营养成分发生改变的根据是(  )

A:部分DNA发生了重组

B:某一基因可以控制合成不同的蛋白质

C:重组DNA控制一种蛋白质的合成

D:有些基因足以使植物体内某些代谢途径发生变化,这可能会导致转基因农作物营养成分的改变

上一题 下一题 0.0难度 选择题 更新时间:2019-03-09 08:38:42

答案(点此获取答案解析)

D

同类题4

阅读理解

    Beijing's markets will soon be flooded with more and cheaper colorful fruit such as orange, mangos and green durian(榴莲)all year round.

    Thanks to a new free trade agreement signed last Monday between China and the Association of Southeast Asian Nations(ASEAN),more and more tropical Southeast Asian fruit will enter the country.

    The agreement means that from July 1,2005, China and ASEAN countries will begin to cut tariffs. There are about 7,000 products included in the cuts. As global communication develops, countries are trading more and more goods with each other. When products are sold across national borders, countries put a tax on them. This type of tax is called a tariff. Just like removing an obstacle from the path of these goods, the reduction of tariffs will encourage trade between China and ASEAN countries. It means more products and lower prices.

    The agreement will bring real benefits for Chinese customers, said a Chinese Foreign Ministry spokesman. “In the Beijing markets you will easily find more tropical fruit like durian, which used to very, very, very expensive. Now they will be cheaper.” The current tariff rate on durian is 22 per cent but will fall to zero in 2005.

    In the first 10 months of this year China did US$84.6 billion of trade with ASEAN countries. Experts believe this may reach US$100 billion next year. Founded in 1967, ASEAN now includes Indonesia, Malaysia, Singapore, the Philippines, Thailand, Brunei, Viet Nam, Myanmar, Cambodia and Laos.

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