班主任工作的中心环节是 (　)A．了解学生 B．组织和培养班集体 C．开班会 D．与

You may get a cold sometimes. It often starts with a sore throat. You sneeze (打喷嚏) and your nose runs. You usually have a headache, too. Often you have a cough later. It’s not a serious illness, but you may feel quite bad.

 There isn’t a cure (治愈方法) for the cold, but you can take some medicine to make you feel better. For example, you can take aspirin (阿司匹林) to get rid of (摆脱) your headache. It is good to rest and drink a lot of water, too. A doctor once told me, “With the right medicine, the cold will last for seven days. With no medicine, it will go on for a week!”

Where does our medicine come from? A long time ago, people knew that some plants made them feel better. For example, the juice of lemons (柠檬) makes a sore throat better. Now, scientists find some parts of plants can make some medicine. Because of these medicines, people now live longer than their grandparents.

小题1:If you catch a cold, you may have _______ at first.

A．a sore throat

B．a headache

C．a cough

D．a stomachache小题2:What should we do when we catch a cold?

A．We should take some medicine.

B．We should have a good rest.

C．We should stay at home and drink a lot of water.

D．All of the above.小题3:What can make a sore throat better?

A．Some plants.

B．The juice of lemons.

C．Aspirin.

D．Fruit.小题4:What does the underlined sentence mean?

A．You shouldn’t take any medicine if you have a cold.

B．There is almost no medicine that can cure the cold.

C．You’ll feel better if you take some medicine.

D．There is some medicine that can cure the cold.小题5:Which of the following sentences is TRUE?

A．Taking aspirin can get rid of the cold.

B．All the plants can be made into medicine.

C．Scientists have found a cure for cold.

D．Some parts of plants may make people feel better.

稳压二极管工作于（）状态时，在电路中能起稳压作用。

紫砂壶史上的一代宗匠是（）

A.许友泉

B.时大彬

C.供春

D.李仲芳

风心病二尖瓣关闭不全伴亚急性感染性心内膜炎患者，心脏超声检查的哪项表现对诊断最有意义（）。

A.二尖瓣面积增大，闭合不佳

B.二尖瓣腱索断裂

C.二尖瓣反流

D.二尖瓣瓣膜有赘生物

E.M型超声见CD段呈吊床样改变

以下三种水泥中活性混合材料含量最多、耐腐蚀性最好、最稳定的是（）

A、P·S

B、P·P

C、P·F