物流中心选址成本最小化的目标不包括（）。 A.运输成本 B.设备购置成本 C.土地成

阅读理解。

    Scientists (科学家) are trying to make the deserts (沙漠) into good land again. They want to bring water

to the deserts, so people can live and grow food. They are learning a lot about the deserts. But more and more

of the earth is becoming desert all the time. Scientists may not be able to change the desert in time.

    Why is more and more land becoming desert? Scientists think that people make deserts. People are doing

bad things to the earth.

    Some places on the earth don't get very much rain. But they still don't become deserts. This is because

some green plants are growing there. Small green plants and grass are very important to dry (干的) places.

Plants don't let the hot sun make the earth even drier. Plants don't let the wind blow (吹) the dirt (土) away.

When a little rain falls, the plants hold the water. Without plants, the land can become a desert much more

easily.

1. Deserts ______. [ ]

A. get very little rain

B. never have any plants or animals in them

C. can all be turned into good land soon

D. both A and C

2. Small green plants are very important to dry places because ______.[ ]

A. they don't let the sun make the earth even drier

B. they hold water

C. they don't let the wind blow the earth away

D. all of the above

3. Land is becoming desert little by little (渐渐地) because ______. [ ]

A. Plants can't grow there

B. There is not enough rain

C. People haven't done what scientists wish them to do

D. Scientists know little about the deserts

4. Which is the main idea of the first paragraph (段, 节)? [ ]

A. Scientists know how to change desert into good land.

B. Land is becoming desert faster than scientists can change it back into good land.

C. If scientists can bring water to desert, people can live and grow food there.

D. More and more places are becoming deserts all the time.

5. After reading this, we learn that ______. [ ]

A. plants can keep (阻止) dry land from becoming desert

B. it is good to get rid of (去除) the grass in the deserts

C. all places without much rain will become deserts

D. it is better to grow crops (农作物) on dry land than to grow grass

关于神经纤维静息电位的形成机制与下列因素不相关的是（）

A.细胞外K⁺浓度小于细胞内的浓度

B.细胞膜主要对K⁺有通透性

C.细胞膜主要对Na⁺有通透性

D.细胞内外K⁺浓度差加大可使静息电位加大

E.加大细胞外K⁺浓度，会使静息电位减少

根据()可以将电信业务分为高峰需求资费和非高峰时段资费

A.业务的需求结构

B.客户类型

C.业务的市场结构

D.业务类型

---Who would you rather ________ the English Speech Contest?

---- Li Ping, I think , is the best choice.

A．have attend

B．attend

C．have attended

D．attending

下面关于党对军队的领导叙述错误的是（）。

A、坚持党对军队的领导就是我军只能由中 * * 党来领导

B、其他党派和政治集团可以在我军中建设组织开展工作，但不能指挥军队

C、坚持党对军队的领导，只能是党指挥枪，决不允许枪指挥党

D、坚持党对军队的领导，是通过对人民军队的政治、思想和组织领导来实现的