[简答题]After spending a few minutes on a crowded city street, the brain is less able to hold things in memory, and suffers from reduced self-control.

[简答题]After spending a few minutes on a crowded city street, the brain is less able to hold things in memory, and suffers from reduced self-control.

[单项选择]

Spending 50 minutes with a cell phone close to your ear is enough to change brain cell activity in the part of the brain closest to the antenna (天线). But whether that causes any harm is not clear, scientists at the National Institute of Health said at a conference last month, adding that the study will not likely settle concerns of a link between cell phones and brain cancer. "What we showed is glucose (葡萄糖) metabolism (代谢) (a sign of brain activity) increases in the brain in people who were exposed to a cell phone in the area closest to the antenna," said Dr. Nora Volkow of the NIH, whose study was published in the Journal of the American Medical Association. The study was meant to examine how the brain reacts to electromagnetic fields caused by wireless phone signals.
Volkow said she was surprised that the weak electromagnetic radiation (电磁辐射) from cell phones could affect brain activity, but she said the findings do not shed any light on whether cell p
A. Cell phone use is dangerous.
B. Cell phone use causes cancer.
C. The human brain is an electromagnetic field.
D. There are about 5 billion cell phone users in the world right now.

[填空题]After a few months, the immigrants____________(就习惯了新环境).

[填空题]After they had worked a few miracles, their imagination increased, and their ambition ________ . (large)

[单项选择]My grandmother died just a few months after my grandfather, even (51) she was in good health and had (52) been sick in her life. My grandfather was a strong independent man who worshipped my grandmother. He never allowed her to work or to want (53) anything and remained deeply in love with her, often publicly (54) his affection, until he died.
He was a traditional family doctor (55) made house calls and regarded his patients (56) his family. My grandmother’ s (57) identity revolved around being "doctor’ s wife". In hindsight I realized she never developed any interests (58) her own. In fact, she seemed to have no interests (59) from his interests. As "doctor’ s Wife", she (60) him, the family and the house. When the children became independent, she became even more attentive to him and didn’t (61) any other interests to replace the missing children.
When grandfather died, we all
A. entire
B. complete
C. total
D. full