20世纪60年代,造成我国外交环境恶化,对我国构成严重威胁的国家是
①美国②苏联③日本④越南 [ ]
A、①②
B、①③
C、②③
D、③④
答案:A
按要求对下列句子进行转换,每空一词。
1. The baby likes loud talking. (变成否定句)
The baby________loud talking.
2. Danny is looking at the dumplings. (对划线部分提问)
is Danny ?
3. Jenny sees a tall green tree. (改为一般疑问句)
Jenny a tall green tree?
4. Would you like some milk to drink? (作否定回答)
, .
5. Danny is looking out of the window.(变成否定句)
Danny looking out of the window.
肺表面活性物质的主要作用包括()。
A.降低肺泡表面张力
B.稳定肺泡容积
C.加速肺液清除
D.维持肺泡-毛细血管间正常流体静压
E.减低毛细血管前血管张力