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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，抑制酪氨酸酶的活性等作用，因此常被作为祛斑物质。
A.
正确
B.
错误
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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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