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简述未成熟DC和成熟DC的区别。

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试述MHCⅠ类分子途径提呈内源性抗原的简要过程。

试述MHCⅡ类分子途径提呈外源性抗原的简要过程。

This achievement was done when most TV shows were filmed live.

A. gross
B. groundbreaking
C. grounding
D. groundless

He his head from the sun with an old sack.

A. shielded
B. sheltered
C. shifted
D. shoved