问题 选择题

腐烂的水果散发出酒味,这是由下列何种生物引起的(  )

A.青霉

B.曲霉

C.酵母菌

D.放线菌

答案

酒是一种发酵食品,它是由一种叫酵母菌的微生物分解糖类产生的.酵母菌是一种分布极其广泛的菌类,在广袤的大自然原野中,尤其在一些含糖分较高的水果中,这种酵母菌更容易繁衍滋长.当成熟的野果坠落下来后,由于受到果皮上或空气中酵母菌的作用而生成酒,是一种自然现象.就是我们的日常生活中,在腐烂的水果摊床附近,在垃圾堆幸福,都能常常嗅到由于水果腐烂而散发出来的阵阵酒味儿.

故选:C

阅读理解

阅读理解.

                                                    The Inventions

    Paper was first made in the year 105. It was made by a Chinese named Cai Lun.

    For over 500 years paper was made only in China. People in Japan learned of paper around the

year 600. As years went by, people in other places began to make paper.

    The lead (铅) pencil is not made of lead. It is made of graphite (石墨). People found graphite in

1564. They thought it was a kind of lead. Today we still call pencils "lead pencils". The first pencils

were made by putting strings (线) around sticks of graphite.

    The first wooden pencils were made by Kasper Faber in Germany in 1761.

    Erasers (橡皮) like those we use today were first made in France by a man named Magellan in

1752. It was Hyman L. Lipman who first put eraser on the ends of pencils. And that is how the

pencils came to be.

1. How many years earlier was paper made in China than in Japan?

    A. About 100 years.

    B. About 400 years.

    C. More than 500 years.

    D. 495 years

2. Germans made paper _____.

    A. earlier than Japan

    B. later than Japan

    C. as early as Japan

    D. as late as Japan

3. At first pencils were made of _____.

    A. wood

    B. lead

    C. sticks

    D. string and graphite

4. Kasper Faber was _____.

    A. an Englishman

    B. a Frenchman

    C. a German

    D. an American

5. Which of the following statements is NOT true?

    A. Paper was first made in China.

    B. Graphite isn't a kind of lead.

    C. The first wooden pencils were made in Germany.

单项选择题 A1/A2型题