产冬羔的配种时间段为（)。A.1~2月B.7~9月C.10~11月D.3~4月

What does the word "xenophobia" (Line 3, Para. 2) mean？

A．The ecological disorders.

B．The passion to save the endangered ecosystem.

C．The ecological imperialism.

D．The fear for alien species.

请帮忙给出正确答案和分析，谢谢！

羊奶可以加工制成()。

A.奶酪

B.炼乳

C.酸奶

D.奶粉

()，()是著名的肉用山羊品种。

Meryl Streep won her third Oscar by her role of

A．an elderly widower.

B．former British Prime Minister.

C．an African American maid.

D．a struggling silent-era movie star.

请帮忙给出正确答案和分析，谢谢！

设一质子和一电子具有相同的德布罗意波长1.0nm。求：