题目内容
（请给出正确答案）
Some of them have eaten nothing but a few bananas in all the______.
A．time
B．same time
C．meantime
D．during time
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更多“Some of them have eaten nothing but a few bananas in all the______.A．timeB．same timeC．mean”相关的问题
EA wind tunnel (风洞) is used for teasing planes or plane models. In a wind tunnel air is blown over a plane or a model placed in a test section (区).Wind tunnel test sections are different in size depending on airflow speed requirements. Some low-speed tunnels have test sections large enough for a complete small plane. In the very high speed tunnels used for space testing, however, the model may be as small as a pencil.
There are two ways of feeding air to the test section. In the constant flow tunnel, airflow is produced by electric fans. It is forced through the tunnel to the test section, then through another tunnel section back to the starting point for reuse.
The other way involves (卷入) storing high-pressure air in a box, sending it out by a controlling device (装置) to pass through the tunnel and test section into another box. This way is usually used for a very short period of high-speed airflow.
Wind tunnels are usually used to test planes before they are flown. Problems in a plane can be found when it meets the high-speed airflow in the tunnel. For example, if the wings are built so that they would weaken (become weak) at high speeds, this fact can be discovered in the tunnel, saving many lives and millions of dollars.
In a wind tunnel, scientists also find out how different planes will act different speeds. They find out such things as how the air dives by the wing surfaces, how slowly a plane can fly before it starts to drop, and how fast it can climb.
第52题：Some wind tunnel sections are larger than others because ________.
[A] they are used large planes
[B] stronger wind can be produced in them
[C] they are built to meet a higher speed test
[D] the wind used in them flows at a lower speed
According to Dr. Serge Jabbour, what message does the study carry？
A．People have to work early on their weight
B．Overweight people have shorter life expectancies
C．Smoking is damaging to life expectancy
D．If people are Overweight by their mid-30's to mid-40's, if they lose some weight later on, they will carry a lower risk of dying
I have many friends, some of them are businessmen .
A B C D
____________
There ______ some misunderstanding between them, they never say hello to each other.
A．being
B．be
C．to be
D．to have been
A、Some of them had failed to enter college at home
B、Some of them wanted to have a better job opportunity in China after their graduation
C、Some of them wanted to seek for more individual freedom
D、null
A、use some vivid slides
B、ask them some questions
C、keep your presentation brief
D、tell some humorous stories
A．alike
B．like
C．same
D．similar
A．Because it helps them to have greater academic qualifications.
B．Because it helps them to gain work experience.
C．Because they can earn some money.
D．Because it helps them to learn more about the Olympics.
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