疫毒痢的治法是：（） A．清热解毒化湿 B．活血解毒和胃 C．凉血清热利湿 D

甲、乙两辆汽车速度相同，制动后均做匀减速运动，甲在3s内前进18m停止，乙在制动后1.5 s停止，则乙制动过程前进的距离为

A．9m

B．18 m

C．36 m

D．72 m

阅读理解。

                                                  Insects Eating Your Crops?

                                                         Call on a Ladybug

      There are lots of insects that farmers hate. But there also are some they like. These protect crops

against damage from other insects. A good example is the lady beetle,also known as the ladybug

      Lady beetles are a natural control for aphids (蚜虫). Lady beetles are red,orange or black. They

often have black spots,though some have light colored spots. Different kinds of lady beetles have

different numbers of spots. There are lady beetles with four,five, seven and fourteen spots.

      Many of the well-known kinds of lady beetles come from Asia or Europe. They are now common

throughout the United States.

      American scientists imported one kind of lady beetle,the multicolored Asian lady beetle,as early as

1916. They released them as an attempt to control some kinds of insects. Over the years,the beetle has

become established,possibly helped by some that arrived with imported plants on ships.

       Experts say over 450 kinds of lady beetles are found in North America. Some are native to the area. Others have been brought from other places. Almost all are helpful to farmers.

      The Asian lady beetles now in the United States probably came from Japan. The Asian lady beetle

eats aphids that damage crops like soybeans,fruits and berries.

     In the southern United States,Asian lady beetles have reduced the need for farmers to use pest-killing

poisons on pecan trees. This popular tree nut suffers from aphids and other pests that the

beetles eat.

      But some people say the Asian lady beetle has itself become a pest. They worry that the beetles may

eat their late-autumn fruit crops.

        Experts say Asian lady beetles may appear in large numbers in some years. But they say the insects

are too helpful to be considered pests.

1. What do ladybugs look like?     

A. All kinds of ladybugs are of the same color.

B. Most of them are red,orange and black.

C. They each have the same number of spots on them.

D. The farms like them.

2. Asian ladybugs have been in the United States for___．    

A. nine decades    

B. hundreds of years

C. half a century    

D. a century

3. Which of the following is NOT supported in the passage?   

A. There are more than 450 kinds of ladybugs in North America,including native ones.

B. Only some imported ladybugs are helpful to the local plants.

C. Soybeans,fruits and berries are favorites of Aphids.

D. Pecan trees are common in the south of America.

4. According to the experts,ladybugs are _____   .    

A. more helpful than considered as pests.

B. more pests than helpful insects.

C. helpful as well as destructive.

D. are more destructive than helpful.

做"研究杠杆的平衡条件"的实验时，图中所示的两个状态均表示杠杆已达到平衡。当杠杆由图甲的位置变成图乙的位置时，弹簧秤的示数将             。（填"变大"、"变小"或"不变"）

阅读材料，回答问题：

材料一

梁启超在《清代学术概论》中说：“鸦片战役”以后，志士扼腕切齿，引为大辱奇戚，思所以自湔（音间）拔；经世致用观念之复活，炎炎不可以抑。又海禁既开，所谓“西学”者逐渐输入；始则工艺，次则政制。

材料二

日本学者福泽渝吉在《文明论概略》中就社会转型的问题说：汲取欧洲文明，必须先其难者而后其易者，首先变革人心，然后改变政令，最后达到有形的物质。按照这个顺序做，虽然有困难，但是没有真正的障碍，可以顺利达到目的。倘若次序颠倒，看似容易，实则不通。

依据材料分析近代中国人引进西学的原因，并概括其大致历程。

预制楼梯安装检验批的验收，应符合（），预制楼梯质量评为合格。

A．主控项目全部合格

B．一般项目的质量验收合格

C．一般项目允许偏差项目的合格率≥85%

D．一般项目的允许偏差不超过最大限制的1.5倍

E．一般项目没有出现影响结构安全、安装施工和使用要求的缺陷