[单项选择]Why have there been difficulties with the machinery for the new product
A. It has been necessary to meet regulations.
B. It is difficult to find suitable equipment.
C. It keeps breaking down.

[单项选择]Why have there been difficulties with the machinery for the new product
A. It has been necessary to meet regulations.
B. It is difficult to find suitable equipment.
C. It keeps breaking down.

[填空题]

[听力原文] 11-15
Chemists have been studying why people cry. They say the body produces two kinds of tears. One kind cleans out the eye if it gets dirt in it. But when people cry because of their feelings, these tears have poison chemicals in them. The body is getting rid of chemicals produced by strong feeling.
In the United States men have heart diseases more often than women do. Doctors say heart disease and some other diseases are related to the pressures of living and working in a modern society. Perhaps men suffer more from these diseases because they do not cry enough. And it is possible that as more and more women work outside the home, they will also suffer from more pressure. Then everyone will need to cry more.

How many kinds of tears does the body produce
（）

[单项选择]Why did Mr. Simpson say that he couldn’t have been driving fast
A. He had only been driving fifty yards on the main road.
B. He had just come out into the main road.
C. He had stopped fifty yards away.
D. He had always driven under fifty miles an hour.

[填空题]What have Edmond Brothers been
They have been ______.

[单项选择]Children have been said to have braininjured child syndrome, hyperactive (极度活跃的) child syndrome and attention-deficit disorder (ADD). As early as the 1940’s, psychiatrists have (62) children with hyperactivity and extremely distracted and impulsive. These frequent name changes show how (63) researchers are about the causes of the problem and the diagnostic (诊断) (64) for the disorders.
In the past several years, the people who study attention deficit hyperactivity disorder (ADHD) have (65) to clarify the disorder’s causes and (66) , and have reasons to believe that it may be (67) Today’s view on this disorder is very different from the beliefs of just a few years ago.
Researchers are finding that ADHD is not a disorder of just attention, but is from a developmental (68) in the brain’s circuitry and self-control. The loss of self-control (69) other important brain fuctions compulsory for (70) attenti

[单项选择]