种子萌发不需要的环境条件是（ ） A．适量的水 B．充足的光照 C．充足的空气

原发性醛固酮增多症最早出现的临床表现应为（）

A.肌无力

B.周期性麻痹

C.夜尿增多

D.高血压

E.心律失常

关于骨盆的组成，下列哪项是正确的（）。

A.骶骨、尾骨、髋骨

B.骶尾骨、髂骨

C.骶尾骨、坐骨、耻骨

D.髂骨、耻骨、坐骨

E.骶骨、尾骨及左右两块髋骨

信息服务

已知微分方程有两个不同的解为任意常数，则该微分方程的通解是（）。

A.A

B.B

C.C

D.D

According to a famous optical(光学) expert, Alexander, who recently visited Shanghai, the developed countries in Europe and America have made rules that children must wear resinous(树脂) glasses instead of the traditional glasses made of glass. This is because the glass glasses are more likely to do harm to children’s eyesight.

Alexander pointed out: wearing the right glasses as soon as possible is still the best way to cure and put right children’s eyesight problems.

In America and Japan the resinous glasses have taken up 80 percent of the glasses market. And some European countries and America have made it a law that children, teenagers and drivers must wear resinous glasses. Now, about 10 million children in China have different eyesight problems and they need timely treatment.

But still, too many parents are buying the traditional glass glasses for their children. This is mainly because many parents know little or nothing about the good points of the resinous glasses. Besides, the price for the new glasses is a little higher than the traditional ones.

小题1:This news article mainly wants to tell us _______.

A．Alexander visited China and introduced a new type of glasses

B．we should wear resinous glasses instead of glass glasses

C．resinous glasses are popular in Europe and America

D．glasses can be made of other materials instead of glass小题2:According to Alexander, the “timely treatment” to eyesight problems is _______.

A．to stop wearing glass glasses any more

B．to buy a pair of glasses and wear them right away

C．to wear suitable resinous glasses at the right time

D．to buy glasses made in Europe, Japan or America if possible小题3: It can be inferred from this news text that _______.

A．resinous glasses are not on sale in China yet

B．resinous glasses are not acceptable in China

C．glass glasses have disappeared on western market because there is a law against them

D．glass glasses are the first choice in China not only because of their price