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【单选题】
下列选项中不属于图像文件扩展名的是________。
A.
BMP
B.
JPEG
C.
TXT
D.
TIFF
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举一反三
【单选题】I never seem to lose any weight, __________I try hard.
A.
even though
B.
no matter how
C.
as if
D.
ever since
【单选题】Mr. Black has been teaching English in a middle school _____ he came to China.
A.
for ever
B.
ever since
C.
since then
D.
long before
【简答题】已知△ABC,∠B=60°,且sinA-sinC+ 2 2 cos(A-C)= 2 2 .求sinC的值.
【单选题】______ you have finished your work, you are free to do what you like.
A.
Now that
B.
Ever since
C.
For now
D.
By now
【判断题】在T细胞活化过程中,所需协同刺激信号主要是通过T细胞表面的B7分子与APC表面的CD28分子结合而提供;在B细胞活化过程中,所需协同刺激信号主要是通过B细胞表面的CD40分子与Th细胞表面的CD40L分子结合而提供。
A.
正确
B.
错误
【单选题】—How long have you been working as an assistant here? —__________I finished middle school.
A.
Ever since
B.
Before
C.
After
D.
When
【单选题】You must be strict with your children _____________.
A.
in the future
B.
in future
C.
from now
D.
ever since
【单选题】关于T细胞活化的协同刺激信号,错误的是
A.
主要由CD28-B7提供
B.
缺乏协同刺激信号,T细胞也可充分活化
C.
与自身耐受有关
D.
可促进IL-2基因转录
E.
可促进IL-2合成
【简答题】△ABC中,若(sinA+sinB+sinC)(sinA+sinB-sinC)=3sinAsinB,则C=______.
【单选题】为T细胞活化提供主要协同刺激信号的分子是()。
A.
CD28
B.
膜表面免疫球蛋白
C.
LFA-1
D.
VLA-4
E.
IL-2
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