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【单选题】
人参、芦荟、当归、桂皮等中草药提取物具有防御紫外线,抑制黑色素生成,抑制( )的活性等作用,因此常被作为祛斑物质。(难度梯度:C)
A.
酪氨酸酶
B.
皮脂腺
C.
蛋白酶
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【单选题】Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts (67) our protective blanket on (68) . Light gets through, ...
A.
from
B.
than
C.
as
D.
away
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【单选题】Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts (67) our protective blanket on (68) . Light gets through, ...
A.
from
B.
than
C.
as
D.
away
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