A.they have to constantly keep an eye on their companions
B.the two halves of their brain are differently structured
C.they have to watch out for possible attacks
D.their brain hemisphere take turns to rest
单选题 | In spite of the ___________ economic forecasts, manufacturing output has risen slightly. | 查看答案 |
单选题 | Cultural _______________ indicates that human beings hand their languages down form one generation to another. | 查看答案 |
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单选题 | A new study on birds’ sleep has revealed that ____________. | 查看答案 |
单选题 | While sleeping, some water mammals tend to keep half awake in order to __________. | 查看答案 |
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单选题 | Which of the following is true about driving on an automated highway? | 查看答案 |
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单选题 | He ____________ his head, wondering how to solve the problem. | 查看答案 |
单选题 | According to the passage, what kind of people are rare? | 查看答案 |
单选题 | The _________of the scientific attitude is that the human mind can succeed in understanding the universe. | 查看答案 |
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单选题 | The helicopter _____________ a light plane and both pilots were killed. | 查看答案 |
单选题 | In some countries, students are expected to be quiet and ___________ in the classroom. | 查看答案 |
单选题 | The two most important ______________ in making a cake are flour and sugar. | 查看答案 |