既能祛风湿，又能退虚热的药物是（） A．独活 B．秦艽 C．防己 D．狗脊 E．川乌

When people want to know about the weather, they usually go to their radios, TVs, newspapers, or to the Internet. However, you can also find many weather signs among wildlife, because of their highly developed senses. Drops in air pressure produce an effect on small animals in many ways. Mice and deer are good weather indicators. People who spend a lot of time outdoors have observed that, before a storm, field mice come out of their holes and run around. Deer leave high ground and come down from the mountains.

Birds are especially good weather indicators because they also show the effect of a pressure drop in many ways. For example, some birds become irritable(暴躁) and quarrelsome and will fight over a piece of bread. Other birds chirp and sing just before a storm. It seems they know they won’t get another chance for an hour or two. Birds also look for safe places before a storm. You will sometimes see birds settling in trees or gathering together on a wire close to a building. Pre-storm low pressure make the air so thin that birds have difficulty flying.

It is unusual to see many birds flying overhead in the summertime, rather than during the periods in the spring or autumn. Watch for other weather signs if you see this. If they fly in the wrong direction, they may be flying ahead of a storm.

By paying closer attention to some important signs in nature, we can become better prepared for any kind of weather.

小题1:The word “indicators” in paragraph 1 probably means          .

A．maps

B．services

C．signs

D．stations小题2:How can birds sense the coming of a storm?

A．By feeling a drop in air temperature.

B．By noticing the change of wind directions.

C．By feeling a drop in air pressure.

D．By noticing the movements of other animals.小题3:The best title for the text would be        .

A．Signs of a Storm

B．Drops in Air Pressure

C．Animals’ Sharp Senses

D．Nature’s Weather Signs

胎盘合成的激素包括（）

A.人绒毛膜促性腺激素

B.人胎盘生乳素

C.雌激素

D.孕激素

E.甲状腺素

混合痔应具备哪些特征（）

A.具有内、外痔双重症状

B.括约肌间沟消失

C.不同方位既有内痔又有外痔

D.内痔部分与外痔部分形成一个整体

下列法律事实中，属于法律事件的是( )。

A．提供劳务
B．偷税
C．地震
D．订立合同

下图是小明设计的测量一小灯泡额定功率的电路图。已知定值电阻R₀=15Ω，滑动变阻器_R(20Ω 1A)，电源电压为18V，小灯泡的额定电压为6V，额定功率约为3W。

闭合开关S前，滑片P应滑到最（）。（选填“左端”或“右端”）