若脓汁标本经涂片革兰染色镜检发现葡萄球菌，试问为确定该菌是否有致病性应该检查哪一种酶

中国人民银行授权中国外汇交易中心公布，2011年10月10日银行间外汇市场人民币汇率中间价为：1美元兑人民币6.3586元，较前一交易日小幅走高1个基点。前一交易日，人民币汇率中间价为：1美元兑人民币6.3587。这意味着[ ]

①美元兑人民币的汇率升高

②美元兑换人民币的汇率跌

③美元兑换的人民币增多

④人民币兑换的美元增多

A、①③

B、①②

C、②④

D、③④

采用实际费用法计算工程索赔时，承包商应得的索赔金额是在（）的基础上，再加上应得的间接费和利润。

A．直接费

B．直接工程费

C．实际发生的成本

D．直接费的额外费用

Scientists are trying to make the deserts ,which get very little rain, 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 against the scientists’ wish．

Some places on the earth don’t get 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 places．Plants don’t let the sun make the earth even drier． Plants do not let the wind blow the dirt away．When a bit of rain falls，the plants hold the water. Without plants, the land can become desert more easily．

小题1:Deserts ____________ ．

A．never have any plants or animals in them

B．can all be turned into good land before long

C．are becoming smaller and smaller

D．get very little rain小题2:More and more land is becoming desert  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小题3:Small green plants are very important to dry places because ________

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

B．they don’t let the wind blow the soil away

C．they hold water

D．All of the above．小题4:After reading this passage, we learn that _____________ ．

A．plants can keep dry land from becoming desert

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

C．all places without much rain will become deserts

D．it is better to grow crops on dry land than to cut them

目前肝炎病毒主要有（）。

A.1种

B.3种

C.5种

D.7种

E.9种

急粒与急淋的鉴别要点是

A．前者多有贫血、发热、出血

B．前者白细胞计数往往更高

C．前者较易发生中枢神经系统白血病

D．前者骨髓增生多极度活跃

E．前者原始细胞POX染色阳性