It is possible to have more than one (75)

当某设备输入操作正常结束时，操作系统将等待该输入操作结果的进程的状态改成

A．就绪态

B．运行态

C．等待态

D．挂起态

诊断儿童苯丙酮尿症最常用的筛选方法是

A．血清苯丙氨酸浓度测定
B．Guthrie试验
C．尿三氯化铁试验
D．氨基酸层析法
E．苯丙氨酸耐量试验

Have you wondered why different animals or pests have their particular colors? Colors in them seem to be used mainly to protect themselves.

Birds, especially seagulls are very fond of locusts, but birds can’t easily catch locusts because locusts change their colors together with the change of the color of crops. When crops are green, locusts look green. But when crops are ripe, locusts take on exactly the same brown color as crops have. Some other pests with different colors from plants are usually easily found and eaten by their enemies. So they have to hide themselves in terror for lives and appear only at night.

If you study the animal life in any part of the world, you will find the main use of coloring is to protect themselves, bears, wolves and other beasts move quietly through forests. They are usually invisible to the eyes of hunters, because they have the color much like the barks(树皮) of trees.

An even more strange act remains to be noticed. A kind of fish living in seas can send out a kind of very black liquid when it faces danger. While the liquid is over, its enemies cannot find it, and it quickly swims away. Thus, it has existed up to now though it is not powerful at all.

小题1:This passage mainly talks about ______.

A．the change of color in locusts

B．the protective coloration of animals and pests

C．how a certain sea fish protects itself

D．animals or pests can dye themselves different colors小题2:Locusts are ______ but they aren’t easily wiped out(消灭)by their enemies because _______.

A．animals; they are powerful enough

B．beasts; they are dangerous to their enemies

C．pests; they take on the same colors as crops

D．birds; they fly very fast小题3:What does the underlined word “invisible” in Paragraph 3 mean?

A．can’t be seen

B．can be seen

C．can’t move

D．can’t change

我国的《公路沥青路面再生技术规范》建议水泥等活性填料一般不超过（）

A.1%

B.1.5%

C.2%

D.2.5%