【简答题】May I have you attention please? I have a little things to tell you. When you have a class here in the language lab, please be here a little early. Change your shoes before enter the lab. Don't bring ...
【单选题】Biologists have discovered certain genes (the basic unit of genetic material found on the chromosomes) that behave very differently depending on whether they are passed down to offspring from the fath...
A.
When a mouse was genetically engineered so that it contained two copies of every gene from its mother only, the embryo was unable to develop.
B.
Research in animals that lay eggs has never turned up an imprinted gene.
C.
Imprinted genes have been found in plants, which have no placentas.
D.
Research has shown that imprinted genes have not evolved rapidly as they usually do in competitive situations.
【简答题】听录音填空 The family, being the basic living unit of society, is the social group with which every individual is most closely connected. On the whole, families in the world can basically be divided into f...
【简答题】Please preview the new words and phrases in Text A of Unit 1, write the correct word according to the following English explanation: 请大家预习 Unit1 A 课文中的新单词和短语,根据下面的英文释义写出对应的词和短语。 the most basic part of...