动词填空，阅读下面短文，用括号内所给动词的适当形式填空(必要时可加情态动词或助动词)。    

     We 1._____ (be) in America for three days.We 2._____ (have) a good time here now. America

is the third largest country in the world．There is so much 3._____ (see) that it's impossible for me

4._____ (tell) you everything．  

     During the past three days we 5._____(visit) many places of interest around New York. I'd like

6._____ (spend) more time here but we 7._____ (fly) to another state of Wyoming to visit Yellow

stone National Park tomorrow, the park is known for its wildlife and geothermal features．The Old

Faithful Geyser is one of the most popular features in the park. It is said (据说)that words 8._____

(not describe ) the beauty of the park. Now we are busy9._____ (pack) our bags so that we will

not lose time when we leave．I hope we can enjoy ourselves at Yellowstone National Park this time

tomorrow. I'm looking forward to 10._____(go) there.

中枢神经系统白血病常见于（）
绿色素瘤最常见于（）

A.红白血病

B.急性单核细胞白血病

C.急性淋巴细胞白血病

D.急性巨核细胞白血病

E.急性粒细胞白血病