某同学使用显微镜观察洋葱鳞片叶表皮细胞临时装片时,如图所示的镜头可供选择,若要在

题型:选择题

问题:

某同学使用显微镜观察洋葱鳞片叶表皮细胞临时装片时,如图所示的镜头可供选择,若要在视野中看到的细胞数目最多,应选择下列(  )镜头

A.A和D   B.A和C   C.B和D    D.B和C.

考点:显微镜的构造和使用
题型:选择题

试述颌骨骨折的临床表现。

题型:选择题
(mx-
1
x
)6
的展开式中x3的系数为15,则实数m的值为______.
题型:选择题

温经汤(《金匮要略》)主治证候的病因病机是()。

A.五劳虚极

B.产后血虚受寒

C.冲任虚损

D.下焦蓄血

E.冲任虚寒,瘀血阻滞

题型:选择题

阅读理解。

     People with less education suffer fewer stressful days, according to a report in the current issue of the

Journal of Health and Social Behavior.

     However, the study also found that when less-educated people did suffer stress it was more severe and had a larger impact on their health.

     From this researchers have concluded that the day-to-day factors that cause stress are not random

(随意的). Where you are in society determines the kinds of problems that you have each day, and how

well you will deal with them.

     The research team interviewed a national sample of 1,031 adults daily for eight days about their stress

level and health.People without a high school diploma reported stress on 30 percent of the study days,

people with a high school degree reported stress 38 percent of the time, and people with college degrees

reported stress 44 percent of the time.

     "Less advantaged people are less healthy on a daily basis and are more likely to have downward turns

in their health," lead researcher Dr.Joseph Grzywacz, of Wake Forest University Baptist Medical Center,

said in a prepared statement. "The downward turns in health were connected with daily stressors

(紧张刺激物) and the effect of daily stressors on their health is much more devastating (毁灭性的) for

the less advantaged."

     Grzywacz suggested followup research to determine why lesseducated people report fewer days of

stress when it is known that their stress is more severe and lasting.

     "If something happens every day,maybe it's not seen as a stressor," Grzywacz says."Maybe it is just

life."

1. Stress level is closely related to _____.

A. family size  

B. social status

C. body weight  

D. work experience

2. The 1,031 adults were interviewed _____.

A. on a daily basis for 8 days  

B. during one of eight days

C. all by Grzywacz  

D. in groups

3. Which group reported the biggest number of stressful days?

A. People without any education.

B. People without high school degrees.

C. People with high school degrees.

D. People with college degrees.

4. The less advantaged people are, the greater _____.

A. the impact of stress on their health is

B. the effect of education on their health is

C. the level of their education is

D. the degree of their health concern is

题型:选择题

如果要导出某种字体并在其他Flash电影中使用,应该使用哪种元件?()

A、字体元件

B、电影剪辑

C、图形元件

D、按钮元件

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