问题
单项选择题
DNA多聚酶的功能
A．DNA合成
B．解开DNA双链
C．消除DNA螺旋
D．连接DNA片段
E．保持DNA合成区单链的稳定
答案
参考答案：A
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DNA多聚酶的功能
A．DNA合成
B．解开DNA双链
C．消除DNA螺旋
D．连接DNA片段
E．保持DNA合成区单链的稳定
参考答案：A
| 任务型阅读。 |
| To find out whether (是否) bees can see colors, the following experiment is made. A round table is put in a garden, and on the table is a piece of blue cardboard (硬纸版) (1) a drop of syrup (糖浆). (3) After a short time, bees come to the syrup. The bees then fly to their hive (蜂房) and give the syrup to other bees in the hive. Then they return to the feeding-place which they have found. After a while, the blue cardboard with the syrup on it is taken away. (2) of this card, a blue card is now put on the left side of the first feeding-place and a red card to its right. These new cards have no syrup on them. Very soon bees arrive again, and fly straight to the blue card. None go to the red card. |
| 1. 在(1)、(2)空格处填入适当的单词使句意完整 ________、_________. 2. 将(3)处的句子翻译成汉语____________________________________. 3. 找出下列句子的同义句 There is no syrup on these new cards. _________________________________________________. 4. 回答以下问题: How many cards do you need to prepare for the experiment? _________________________________________________. 5. 在文中找出文章的主题句 _________________________________________________. |